How to complain more effectively – According to millions of cases

Most people do not complain very often, so when something does go wrong, your flight is delayed, your insurer rejects a claim, your broadband provider misses an installation, your bank freezes your account or a retailer refuses a refund, you suddenly find yourself trying to navigate a complaints system you probably do not fully understand.

Modern customer service systems are not always built to make that easy, you wait on hold, repeat yourself to multiple advisers, get vague updates, scripted responses or promises that somebody will “look into it”. Sometimes you are told the issue has been escalated, but nothing appears to happen afterwards.

After a while, it is easy to assume complaints are mostly about luck, but after helping consumers handle millions of complaints, Resolver has seen some clear trends and some complaint habits consistently lead to better outcomes. Not because companies suddenly become more generous, but because certain approaches make it much harder for organisations to delay, deflect or quietly dismiss your complaint.

The complaints that tend to move fastest are usually:

• organised
• evidence-based
• specific
• persistent
• escalated at the right stage

In other words, the people who get results usually understand how complaints systems work in practice.

Don’t wait too long

One of the clearest patterns Resolver sees is that many people only start collecting evidence once they realise the company is not going to fix the issue quickly, but by then, important details are often already lost. Screenshots disappear, chat histories vanish, Tracking statuses update, names of staff are forgotten and emails become harder to find.

The complaints that usually progress more smoothly are the ones where the evidence trail starts early.

That means keeping everything from the start, including:

• screenshots
• receipts
• confirmation emails
• tracking numbers
• photos
• dates and times of calls
• names of advisers
• copies of policies or terms

Increasingly complaint systems rely on this documentation and without evidence, your complaint can quickly become hearsay, but with the evidence, you can demonstrate and paint a clear picture of what has happened and that changes the conversation immediately.

Specific complaints usually get better responses

Resolver also sees many complaints stall because they stay too broad.

For example:

“Your service has been terrible.”

This may be true, but it gives the company very little concrete evidence or fact to respond to.

Compare that with:

“I reported this issue on 14 May and again on 21 May. I was told it would be resolved within five working days, but I still have no service.”

This is much more specific, both in terms of explaining what has happened and your expected outcome, making it much harder to ignore.

The complaints that tend to move fastest usually explain:

• what happened
• when it happened
• what impact it caused
• what outcome you want

The final part of clearly stating your desired outcome is often missed, but it matters more than you might realise.

Do you want:

• a refund?
• compensation?
• reimbursement for additional costs?
• a repair?
• a replacement?
• an apology?
• the issue escalated?

The clearer you are, the easier it becomes for the company to resolve the issue.

Persistence matters more than anger

Many people assume successful complaints come from being forceful or confrontational. But Resolver’s experience handling millions of cases suggests persistence is usually far more effective than aggression.

Most frontline customer service teams already deal with frustrated customers constantly. Large companies often have systems specifically designed to absorb emotional complaints while limiting escalation.

What tends to work better is calm persistence.

That means:

• following up consistently
• asking for updates in writing
• escalating when necessary
• keeping communication clear
• refusing to let the complaint quietly disappear

Modern complaints systems often contain friction by design, building in long wait times, endless transfers, repeated security checks and chatbots can all wear people down, and the reality is that every customer who gives up saves the company time and money.

Certain phrases genuinely change the conversation

You do not need legal training to complain effectively, but Resolver regularly sees companies respond differently once customers start using more formal complaint language.

Phrases that often help include:

• “Please treat this as a formal complaint”
• “Can you confirm your complaints procedure?”
• “I would like this escalated”
• “Please provide your final response in writing”
• “Can you explain how this complies with the Consumer Rights Act?”
• “I intend to refer this to the Ombudsman/Regulator if unresolved”

Your aim is not sounding aggressive, but showing that you understand there is a formal process beyond the initial customer service conversation. Once a company believes a complaint may escalate externally, the internal risk calculation changes.

One of the biggest mistakes is arguing with the wrong team

A huge amount of customer frustration comes from spending too long repeating the same conversation with frontline support teams who often have limited authority to resolve the issue. Resolver consistently sees complaints improve once customers stop treating the issue as a customer service conversation and start treating it as a formal escalation process.

That may mean:

• asking for a complaints reference number
• moving communication into writing
• requesting escalation to a specialist complaints team
• asking for a deadlock letter
• escalating externally

Persistence matters, but targeted persistence matters more.

Knowing your rights changes the balance of power

Many consumers underestimate how regulated complaints processes already are.

If your complaint involves:

• financial services
• insurance
• telecoms
• energy
• travel
• housing

There may already be ombudsmen, regulators or dispute resolution schemes involved. You do not need to become a legal expert, but understanding that external escalation exists often changes how companies respond internally.

Resolver sees this particularly clearly with financial complaints. Once firms believe a complaint may reach the Financial Ombudsman Service, cases often move more quickly because external complaints carry financial and regulatory consequences.

Timing matters more than most people realise

Complaints become harder to resolve the longer they drift, evidence disappears, staff move on and time limits expire. That is especially important in areas where formal complaint windows apply, including:

• financial complaints
• chargeback/section 75 disputes
• travel compensation claims
• delivery disputes

The earlier you act, the more leverage you usually have.

Resolver exists because complaints systems are increasingly difficult to navigate. One reason Resolver has grown is because many consumers feel overwhelmed by complaints systems that are increasingly fragmented, automated and difficult to challenge.

More decisions are now:

• outsourced
• algorithmic
• hidden behind apps or chat systems
• spread across multiple departments

At the same time, customer service teams are under pressure to reduce handling times and reduce costs.

Resolver can help to navigate those systems:

• finding the correct complaints route
• escalating issues properly
• keeping records in one place
• tracking complaint timelines
• accessing ombudsman information
• understanding your rights

If you are stuck in a complaints loop or struggling to get a response, you can raise a case with Resolver, For many users, simply having structure and guidance changes the outcome completely.

As Timothy put it:

“Great experience with Resolver, helped me negotiate a significant incorrect energy bill to £0. Would recommend.”

Kay had a similar experience after struggling to get a refund:

“After message after message to Debenhams regards not refunding my returns! Contacted Resolver, within a week got my refund! Wouldn’t hesitate to contact again.”

John used Resolver across multiple disputes:

“Resolver gave us help with our flights compensation within weeks €1200 and also helped us with our power company and through the Ombudsman for a settlement and mediation. So there is no end to what this company Resolver can do for you if you don’t know which way to turn.”

If your own flight has been delayed, cancelled or disrupted, you can check whether you may be entitled to compensation using Resolver’s flight compensation checker.

Amanda described the difference it made when dealing with private parking firms:

“This is an amazing service and the word really needs to get out to the general public who may be dealing with ruthless companies particularly private car parking companies and you feel you have nowhere to turn … BUT YOU DO YOU HAVE RESOLVER.”

And for Tommy, the difference was speed:

“Just got me a refund I’ve been waiting 3 months for!! Thank you Resolver 10/10.”

Public pressure can still work

Public complaints still carry weight, especially when companies are slow to respond privately. That does not mean posting abuse online or aggressively tagging brands repeatedly.

In fact, concise factual complaints usually work better. A short public post clearly explaining what happened, how long the issue has remained unresolved and what response you have already received can sometimes trigger action far faster than multiple private conversations. Companies know unresolved complaints can quickly become reputational problems once they are visible to other customers, particularly if people recognise similar experiences themselves.

The real lesson from millions of complaints

The biggest thing Resolver’s complaint data shows is that successful complaints are rarely random. The people who get stronger outcomes are usually not the loudest or most aggressive.

They are the people who:

• collect evidence early
• explain problems clearly
• stay organised
• escalate strategically
• follow up consistently
• understand when to move complaints higher

Because modern complaints systems increasingly work less like conversations and more like processes, and once you understand the process, you are far more likely to get the results you need.

If you are struggling to get a response from a company, stuck in an endless complaints loop or simply unsure where to escalate next, you can raise a case with Resolver and manage your complaint in one place.

And if you have your own consumer story to share, whether it is a complaint success, a frustrating experience or something you think other people should know about, Resolver would love to hear from you.

You can also sign up to the Resolver Newsletter to stay up to date with the latest consumer rights changes, complaint trends, scams, travel disruption updates and practical advice on dealing with companies more effectively.