In particular if you are thinking about finding a new ISP in the UK take a read at uk isp review website here:-
http://www.ispreview.co.uk/index.shtmlNote the problems with giointernet and tha hauka group in particular!
They came on me for £671.16 when I only owed £60. If I hadn't told them, they would not have known they had provided me with free dial-up.
Avoid them and their associate companies or risk your sanity.
Trading Standards, Ofcom and possibly other organisations are onto them and the administrators are already in there!