@npowerhelp All 3 people I spoke to yesterday could not work out why £173 is still showing outstanding on my account even though they could see that I have in fact OVERPAID by £9.84
Over 2 years later, the ordeal starts again. 2 hours in the phone, no help and told I have to phone a number between 9-5 mon-fri which I can't do as I'm at work!