Complaint-Continuing Billing After Cancellation

I’m unhappy that Xfinity mobile is unwilling or unable to stop charging my credit card monthly even though I cancelled my service more than a month previously.  When I asked for a refund they did not refund the full amount and kept $2.03 dollars.  I have since asked my bank to cancel the recurring charges but they said that they cannot guarantee I won’t have the same problem in a month.  At this point I would like to file a complaint with Xfinity but there is no way to reach them or even access my billing details bc account is cancelled.

 What happened to reaching by email? Only option appears to be via a wholly inadequate chat with possible non human.

i have no way of getting the account details so that I can provide them to this forum since they do not show up in the Xfinity app and going to website causes a freeze bc information doesn’t exist.