TLDR: aggressively tried to make me install a smart meter. When I left, tried to inspect my meters 6 months after switch to another provider. Wanted to charge me £8 as I left; after my complaint, turned out, they owed me £80 instead. Avoid this mess. Became OVO PAYG customer accidentally when they bought my previous provider, SSE. Soon after, OVO aggressively tried to force me to switch to a smart meter. I then changed the provider to the company that had no problem with non-smart meters (yes, there are quite a few). 6 months after leaving OVO, I am contacted by the OVO contractor who demand inspection of my meters. I write to OVO and ask to update their database. Then I get to know that I owe OVO £8 + interest. That's totally impossible as I was PAYG and had >£30 on my gas/el accounts when I was leaving. I file a complaint and after 10 days: "Oops, sorry, it's actually us, OVO, who owe you £80 instead" Their database and calculations are all mess - AVOID!