theres a list that BT can put you on that makes it illegal for telesales people to contact you. Its not X directory as that just witholds your number from the phone book, but theres a white list or something like that.
Anyway if a telesales person calls you once your on this list you can sure them £2000.00 for the privilage.
Every telesales company should check all the calls they make with that list on a daily basis and they dont. Sue way to make a few bob like, and youll soon get to love telesales peolpe
however once your on the list you find that the amount you get will seriously reduce