finally sorted out our npower account in jan this year, after 6 months of wrangling. they forgot to change our tariff despite sending a letter, telling us of the change!!
had to go through previous bills, back to jan '08, make endless calls to "customer services" & only got satisfaction when connected to complaints dept. (should be the largest dept. in the company).
we received combined rebates of £260 plus a £50 cheque as a sop (after more calls to chase it up - when we were told it had already been sent) for the countless hours of hassle incurred.
we then changed to online 17 & were surprised to see that our electricity meter reading starting point for the next bill was 320 kwh before the last reading on the previous bill. or, about £35 more than it should be.
when contacted, the usual response was given. "the reading is right & we can't see the figures you quote from your last bill" despite me having a copy of the bill which they had sent in front of me. it transpires that this bill was created manually & the minions do not have access to it. now complaints are springing into action again!!
they even managed to insert the wrong rebate figures & account balance from the previous bill, although in fainess they were both £20 less, so it did balance (so i am only nitpicking there).
BE VERY AFRAID IF YOU DEAL WITH THEM & ALWAYS CHECK YOUR BILL THOROUGHLY. THEY ARE NOT VERY GOOD AT ACCOUNTS. which is a bit poor, because it would appear to be a large part of their business.
the mistakes are always in their favour (surprised??) which would not be the case if genuine mistakes were being made. i really believe that people who do not or cannot check their bills will be overcharged regularly, little wonder their profits are so good.