I have had similar problems. Was once a strong advocate of talktalk broadband, as if it worked it would be good value for money.
As it is, the nice Sky man comes tomorrow. What irritated me most was that every time I phoned, the reason my broadband didn't work was be cause i had - and I quote - "an unauthorised third party router". That would be the
Belkin one CPW sold me as an official TalkTalk package router etc kit would it??!
Grrrr. Now just annoyed that as I paid TT line rental, it will take longer to go to sky, and I may be broadband-less for a couple of weeks. Deeply annoying.