Refund After Cancelled Service

I cancelled my Xfinity service in August and was told on the phone while cancelling that my final bill would be pro-rated to $7.21. When I later went to pay I was charged the full month's service ($69.99). I chatted with a Xfinity representative on the website about the bill and was told that because I cancelled after the bill had been posted I would be charged the full month, but would later refunded the difference ($62.78). 

I paid the bill (big mistake I guess). A few weeks later when there was no evidence of a refund, I chatted again with Xfinity and was told the $62.78 would be deposited to my bank account in 10-15 days. Yesterday, when there was no evidence of the refund being posted, I chatted with a Xfinity agent again and was asked if I had gotten an email about the refund. I said I had not. They told me I would receive an email in 6-24 hours, where I could input payment information for the refund. 

I have not received any email. I chatted again with an agent again today who told me the refund would be issued 30 days after the last bill posted. I pointed out that the last bill posted on August 11, 2024 and that it had been over 30 days. They informed me a final bill would actually be posted Oct.1st (today) but there is no evidence of a new final bill on my account. 

I see the credits listed under "Upcoming Charges" on my account, but the refund never seems to post. I am tired of getting different answers every time I ask. I cancelled my service over a month ago. I would like my refund of $62.78. What do I need to do to receive my money back? It feels like Xfinity has stolen my money.