I have 2 properties and experienced the same systematic overcharging for both of them. They massively inflate your meter readings and then hound and threaten you for money. For one of the properties they actually set up 2 accounts and double charged me (dispute still ongoing). For the other they spent 7 months threatening me with crazy bills being 'amended' on a regular basis, the highest being around £1000 for a couple of months that would notmally only be about £100-150) before eventually accepting they'd overcharged me and REFUNDING me over £600. Stick to your guns and don't let them bully you into paying what you don't owe as it's basically extortion and report them to the ombudsman if they continue. This website needs a negative star rating option for companies like this as they really are the worst of the worst.