Our problems have been going on for 4 years now. Firstly, they got us to switch by fraudulent claims about usage. Then our bills were sky high and we questioned this. Then the bills stopped and they demanded over £3000 from us!! We had heating engineers out who said our meter may be faulty. This was endorsed by the national grid. N power more or less forcibly removed our meter and claimed it was OK!! Yet our recent own readings prove we are using almost less gas than we were before. Each time we ring them we are lied to. At one stage they requested the number of the new meter which I had already sent off. The operative demanded I give it to her and, as I have arthritis I couldn't get up off the floor again. My husband is registered disabled and they really don't seem to care that they are pushing us to the brink by their lack of organisation and fictitious bills. Meanwhile, we can't migrate as until I'm well enough to write to the Ombudsman they say we still owe them money. WORST energy supplier EVER!