When i was switched from Southern to ovo i was assured whatever my deal was with southern would be what i had with ovo. I was quarterly bill paid on receipt of bill.And southern (in writing) had agreed they would read my gas meter quarterly as its outside and difficult for me (i'm disabled) to reach Well it took many many months of ovo billing monthly and me sending letters and e mails ect before i got quarterly billing. And no meter reading- i had to get neibours to do it it for me! And found out many ,many months after they finally seemed to get it right that ,as ovo is set up for monthly , they dont seem to have any way to bill quarterly. What they did was bill me every 3 months but just for that months usage-so for example for the quarter of oct/nov/dec 2022 the bill was issued end dec and i got told via email what the amount was -but that was just for december ! So i did what i always did with southern who would tell me in an email what my gas and electric costs were -i'd log into my account and go straight to bill pay and pay what the email said i owed and thats me done for another 3 months. So when i though i'd paid off my quarterly ovo bill i still had 2 months of the quarter unpaid! . So once but several times and i was congratulating myself on how careful i had been to cut back on my usage. Found out in march 2023 when i went to pay j/f/m bill and it pooped up i might want to pay more! Which i thought odd as i had been (i thought) paying my bill in full so why would i want to pay extra. Found out to my horror i had an outstanding bill for over£1000 that had built up my time with them . When i asked ovo why no one told me i wasnt fully paying my bill -that southern wouldnt let me get away with not paying all my bill and when did they plan on telling me -they said their policy states they contact 'none-payers' who dont pay ior dont pay n full within 14 days of the bill being issued and have no idea how i 'slipped through ' for so many,many months! But if i had checked my account regularly i would have seen the deficit. True i suppose but doesn't excuse them from not following their own policy!! And i had to come up with a grand to pay them off. And the only way i could was use the money i had been putting aside to pay my taxes(foreign pension not taxed so i am year self assessed not PAYE) So my taxes havent been paid! So june 19th i moved -the past tenet of my new property was ovo and i wanted to switch. So (as required) i set up a temporary account with ovo which closed on the 21st when i went to octopus That went fine and i was billed and paid ovo for the 2 days i was with them-so am no longer their customer. . Only now i am bombard with bills from them for payment of gas and electric from before i moved in! Ovo CS says ignore anything addressed to 'the occupier' but the last one -july 3rd is getting a bit nasty. And i am worried they will go after my credit rating which is excellent . I have talked to them so many times -finally e mailed them saying stop!! That trying to get money i dont owe them from me is harassment and ,given i'm elderly and both physically and mentally disabled(bi-polar) , this is bordering on bullying . If they dont i will go after them So Ovo is the bad smell that just doesnt go away