Apallingly bad PR for BT! Why there isn't a simple button to cancel, only BT knows, but probably so that their advisors can try and sell you something?
I was put on hold for ages, then spoke to someone who didn't seem to understand the problem and then put on hold again while she spoke to someone who did, and eventually I managed to get the package (which I didn't ask for, didn't use, was supposedly free, and now, wothout warning, was going to cost me £15 per month from November). I'm seriously thinking of leaving BT.