Ovo, which took over SSE’s customers last year, incorrectly billed over 500,000 customers.
Some customers didn’t receive a bill at all.
Ovo then issued inaccurate information about the issue to around 160,000, while many customers who were overcharged by less than £10 were not refunded.
If you believe you were overcharged by Ovo, make a complaint via Resolver.
Want to learn more about your rights?
Check out our guide to energy providers.
It has everything you need to know about your rights as a consumer.