[Flubflow]

If it were me then I would arm myself with a log of the CS calls from my phone bill(s) (to at least prove how many times they've been contacted by me) and then drive down the NTL office (luckily the NTL office is only a couple of miles away from me) and ask to speak to the organ grinder rather than his monkey for a serious "chat" about the situation. Stay rooted to the spot until you get it sorted and get refunded for their billing error.

BTW, welcome to the forums sgt