I had my line rental supposedly taken over by Tiscali. They sent me a letter saying the take over of the line was in progress, then I got a letter saying there was a problem, but when I called up, the Tiscali operator said "Sometimes these letters are sent out in error." Typical Tiscali waffle - it turns out they hadn't taken over my line, and in the meantime had already taken the money upfront.
I stayed with Tiscali because it was all part of the broadband deal. BT refunded me part of the money I paid - a lot quicker than Tiscali, I might add.
You're best talking to the Tiscali High Level Complaints Executive about this, because the call centres will just tell you anything out of their rear ends.
The Head Office is 020 70872000.