Was migrated to OVO from SSE on 14/12/22. They ordered me to change from 3 monthly bills paid by DD in arrears (as I'd done for 20+ years without ever failing to pay a bill on time) to monthly DD in advance or change supplier. DD to be £74 a month. Then told "Sorry we made a mistake, your DD will be £61" but they've been taking £74. Then (8/2/23) told they'd reviewed my usage (in Jan / Feb?) and suggested I need to increase my DD to £83 or by the end of the year I'd be £107 in debt. Today 22/2/23 another letter telling me that as I hadn't increased my DD as "advised" they are increasing it to £87 per month. They have also not credited me with my October £66 Govt. Support Payment, so I've probably lost that. They are either so chaotic that they shouldn't be running a major energy company or they're a bunch of crooks. I'll be contacting the Financial Conduct Authority / Ombudsman about this useless company. They're more like the Mafia and run their company using fear and chaotic "accounting" to get away with robbery and extortion. BTW. by my calculation using my smart meters' usage readings (in Jan / Feb) my DD actually needs to be £71 per month to end the year without getting into any debt.