Xfinity support

"I am being billed $45/month for an unactivated Xfinity Mobile line that I cancelled prior to activation. There is zero data or talk usage on this line because the SIM was never used. I am requesting an immediate corporate escalation to fully cancel this mobile account and credit back the incorrect charges."

I have called Xfinity 2 times regarding this issue, even escalated to a supervisor.

This prac is fraudulent and I demand the mobile account to be cancelled and the money credited back to my Amex.