Absolutely awful company. We left Npower because they were overcharging me for gas and electricity. After leaving them we received a final demand letter from them for over £200. It basically said 'pay up or we are passing the debt to a collection company. As we were in credit when leaving Npower, I failed to see how there could be a debt. Made a complaint and then received a phone call saying we had no option but to pay, if we did not then a debt collection company would collect on Npowers behalf. Three months down the line, and hours of phone calls and emails later. Turns we owed nothing to Npower at all. They are blaming our new supplier for, apparently. giving them the wrong information.' Npower cancelled the debt we never owed… as a gesture of good will! Npower caused us lots of stress and upset during the 3 months. Their final response… Take it up with the Ombudsman. All I can say is, please read all the reviews on here before making your mind up if you’re thinking of switching to Npower. Companies do not get bad ratings for nothing, and Npower have more than most.