Charging even after disconnect for last 3 months

You are charging me from last 3 months even though I disconnected/cancelled my account 3 months back. It is getting auto debited and I am not able to cancel it from Bank. There is no way to connect or interact with Xfinity real person as all goes into AI agents which is of no help. 

How to escalate or whom to reach out for this? Need a resolution ASAP, else would like to file a case. 

I am not in USA right now and all calls are internaltional charges. you need to understand the customer time and cost involved to make your mistakes corrected with our own money.