You'll probably see our thread about the approx £850 electricity bill and the £770 gas bills - it's the thread which a record breaking number of typos in 1 posting ;-)
We too can not believe how high our bills are. Now we couldn't pay the bills immediately and this is where is gets interesting with npower - certainly if you dispute the bill.
We have managed to pay them something like £1300 in the last 6 weeks alone. We didn't even get the gas bill. We found out about that bill when a door step collector came to the door to discuss putting in a prepayment meter. She was promptly told where to go.
Have to say that npower have done nothing but bully and threaten us over these 2 bills. Tried to move supplier but they rejected the move due to £400's still being owed at the time of the switch request.
Be careful with this Company. We are going to settle the outstanding amount next week and then get rid of them ASAP.
Also now looking to take action over npower refusing to send out the Gas bill despite 2 telephone calls asking them to do this.