You have my sympathy Andy, similar thing happened to us when we moved in here, spoke to the India call centre (who I had already told that the problem was in the exchange as advsded by sales dept) and he asked me if I would get down on my hands and knees and take the cover of the BT point in the hall. He got quite offended when I suggested he did more than read the next part of his "script" Called the sales dept back and a very helpful lady in Watford rang our exchange and got it sorted in less than an hour.