LillLin:I've just received a bill from BT which includes a £7.50 'penalty charge' (my choice of words) for not using my phone. There is no written agreement between me and BT regarding this charge. Surely this must be an unfair charge.
The service you have been charged for is called "BT Privacy at Home", "free" Caller Display as long as you make a couple of calls with BT per month. Possibly even "free" BT calls count but don't quote me.
For most people quite an easy threshold to satisfy and in fact if you Google the issue you will find evidence of customers complaining they are paying for Caller Display and didn't know about "Privacy at Home"! Interestingly the alleged BT response was that "Privacy at Home" was an opt-in service, which is what I clearly remember doing.
The issue therefore is to challenge BT to provide evidence of your opting-in. They may or may not manage to provide that evidence. If they fail to convince you raise a formal complaint strictly in accordance with the BT Code of Practice on Complaints.