Welcome to this user forum.
You should not be charged for incoming calls unless you are answering them, and perhaps pressing some buttons which is initiating an outgoing call.
You may have a fault on your line.
I have asked a moderator to provide assistance, they will post an invite on this thread.
They are the only BT employees on this forum, and are based in the UK.
How do I locate my private messages?
Also I did not accept the calls as I was away from my home during the starting period. I have since unplugged my phone. I have scam protection on my phone that asks the caller to say whom they are before I answer, could that be why?
What are the numbers that are showing? Are they known numbers to you?