I`ve also had the calls purporting to be from BT, The first one told me that my bills in future would be reduced by 37%. I said "that`s interesting, seeing as I`m not with BT", she immediately hung up. The next day was call 2, again saying that my bills were going down by 37% and listing no end of free calls that I could have. I said "thank you, that`s very generous, especially as I`m not with BT. She asked who I was with, I told her it was none of her business, she then listed another half dozen companies, saying that they had dealings with them also, and she presumed I was with one of them, again I said it was none of her business, she started talking again, but I hung up.