The Gas and Electricity company SSE was forced to apologise after being hit with a record penalty for deliberately misleading customers. The energy watchdog fined the firm £10 million for what it called "prolonged and extensive" mis-selling.
As our Business Editor Laura Kuenssberg reports, they tried to trick customers into switching to them.
We speak to one of those who was actually doing the selling. He left the job because he found he had to 'take advantage of a human being.'
A guide to some of the options open to you as a consumer if you believe you have been mis-sold to by SSE or any other energy company.
Ofgem's £10.5m fine imposed on SSE is the biggest ever authorities have imposed on an energy supplier.