OVO Migration and Backbilling HELL

MoneyMoaner55

Hi Guys, looking to see if anyone else experienced the same issue and had this resolved or are still battling this.

I was with SSE and had no issues but in 2022 was told my account would be migrating over to OVO, I didn't seem to have a choice in the matter. I was told my Gas account was migrated in November 2022 but my Electricity would follow later, this finally occurred in August 2023. My Gas account had gotten lost despite me chasing. I was unable to set up any account until my Electricity was finally moved. I raised this several times being referred to different teams and back again before finally putting in an official complaint in November 2023. I had been over paying my Electricity this point to cover the expected sudden bill...this didn't arrive.

I was the instigator and chased us regularly until an advisor told me my account would be reviewed for write off and I wouldn't have to pay anything from before my first bill. The exact words "When your Gas account is set up it will be reviewed for a write off for the period of time that you have not been billed". I followed this up with a call to clarify. This was February 2024. Great I thought, I stopped pestering them, stopped overpaying my Electricity, requested a payment of the credit and patiently waited for my account to be set up, the onus now fully on them. I received generic "regular update" with the exact same wording every 2-4 weeks. 

Fast forward to June 2025. Coming up to 3 years later, I finally have an email out the blue say my account is nearly set up, I would need to send a reading and wait for the bill.

Bemused, I queried the bill and referred the the previous statement only to be told they had no record of this agreement. This lit a fire inside me and I'm now practically a self-taught expert on the consumer rights act, the energy ombudsman and backbilling. 

Despite my providing the email evidence, they are still persisting on "correcting" my bill. I have been charged a standing order back to June 2020, despite me paying my old providers bills up until I was moved. Unfortunately I all my SSE bills were online and I can't access them anymore.

The latest "offer" they made me was "write off" a portion of the balance which I have calculated to be exactly everything from 12 and prior, masquerading this as them doing me a favour and not simply because they legally cannot charge me for it. 

I'm wondering whether anyone else has been in this position and had a positive outcome before, whether you think its worth fighting. The balance remaining would be roughly £500. 

I submitted a Subject access request as I really want that phonecall to prove the email which I admit left room for interpretation. I also quoted back-billing code, Consumer rights Act and Energy complaints handling regulations in my battle for justice.