Charged twice for remaining device balance on closed Xfinity Mobil account

My Xfinity account is closed because I moved to an area where Xfinity service was no longer available.

One phone was still on the Xfinity Mobile plan and the device had a remaining unpaid balance. Xfinity charged me twice for that remaining device balance.

I have called customer service multiple times and was transferred to four different representatives. One representative reviewed my account and confirmed that I was charged twice, but I was transferred again and the call was disconnected before the issue was resolved.

Since my account is closed, text/chat support will not assist me and keeps directing me back to phone support.

Please review my closed account, confirm the duplicate device charge, refund the duplicate amount, and provide me with a case or ticket number.

I can provide the phone number, previous service address, account information, and payment details by private message.