Overcharged for bill after moving home from pre-pay meter (£232), refused to let me pay at the time, didn't want to help at all and then took us to court with a £726 bill, which is now costing us £959 because the phone with photo evidence on got broken. They're customer services are bullies, unreasonable and miraculously everything you provide to them will 'disappear', so keep your records for a long long time as it might come back to haunt you