Biggest regret was using Ovo Energy as my electricity supplier. Migrated from SSE, was paying regular DD, there was an issue with the meters in the block of flats I was renting, explained this to Ovo and asked for an engineer to visit and inspect and they wouldn't due to COVID and offered no alternative support. Tenancy ended June 2022 and I advised OVO I was moving and would no longer be using them as my supplier. I was then given a refunded of around £3 which I thought was the end of it. In August 2022 I was sent a bill of around £1,800. I rang Ovo to query and they were not helpful in the slightest. Advised they would raise a case and put this on hold however, this did not stop them texting me chasing for the money. Weeks later on one of my chases to Ovo, I was told the case had been closed as the issue had supposedly been resolved meaning I was happy to pay which was completely untrue. Continued trying with Ovo to resolve this however, I was getting nowhere so I raised a case with the Ombudsman and sent as much information as I possibly could. This has been ongoing since June 2022. I was told 6 months ago I would received a revised bill and a goodwill gesture. On 19/12/2023 I received an email stating my final bill is ready and my account is in credit and they are refunding me a total of around £137. Unfortunately, I do not trust this company in the slightest and I feel this is not the last I will hear from them. I will continue to raise cases with the Ombudsman as the way they treat people is disgusting and they shouldn't be allowed to get away with this.