I was with npower for just over a year. During this time I was paying £68 a month for a 2 bed flat where I lived alone. A few months in, I was sent a bill saying that my direct debit was going to be increased to £200 a month!! I contested this and it was put down to a computer default. And returned to my normal rate. Towards the end of my tenancy I was sent a bill to say that I was £700 in credit. I called to collect this money, but was told that it would be refunded to me on the closure of my account or if I continued with them as a provider, my payments would be reduced next year to included this money. On closing the account I was sent a final bill for £770.06! For a years worth of electricity and with paying direct debits. I contested this, but was told it was correct. I went to the financial ombudsman who investigated and told me the calculations were correct but a goodwill gesture would be taken off, if I was to accept that the bill was correct. Today, 13 months after leaving the property I have been sent a bill from npower for £4.62! After all this time they have readjusted my bill and actually looked at my usage over the year instead of trying to grab my money. I have paid his amount and will never again use npower as a fuel provider. If I were you, I would stay away. Nothing but stress and worry about the extra money...which I do not have!! I should sue for this stress and worry!!!!