Missing Refund

We were charged $82.92 on 9/17/25 in error after we had closed our mobile account with Xfinity. This overdrew our account and we were charged $10 by the bank. I previously reported this to Xfinity through chat and was assured that the issue was being escalated and I indeed was mischarged. I have heard nothing back and have not received a refund. This is unacceptable. I tried calling Xfinity but could not get through because I am no longer a customer and don't have an account number. Please help me. Melissa [Edited: "Personal Information"]