Refund needed, getting the "Xfinity run-around"

Inexplicably, my Seasonal Convenience Plan ended 2 months early and I was charged for an active month via autopay billing.

I have called, chatted, sent smoke signals, etc. to try and get this resolved, to no avail.  I am beyond frustrated.  I spent two hours one evening on the phone/chat struggling through several folks at an overseas call center that kept transferring me, "escalating" me, and passing me around a bowl of stuffing at a Thanksgiving dinner but never actually making any progress except for my blood pressure.  They all "did not have the authority" to issue this refund, and after trudging through the situation from beginning to end with each agent, each challenged the time period of my SCP, for which I have an email, dated 9/17 from Xfinity confirming the dates.  None of these people claim to see a record of such an email, which conveniently, I am unable to share via chat or phone.

The last person I spoke with said they were escalating this to their "back office" and someone would be reaching out between 24-48 hours to help.  You won't be surprised to learn that was 96 hours ago.

I do not see any easy way to email someone whom can actually digest and resolve this issue, so I am posting here as a last ditch effort before I contact the Florida Public Service Commission to file a complaint.  I have spent an inordinate amount of my time on what should be a very, very simple issue to resolve.  I see Starlink in my future.  This is ridiculous.

The reference number I was given (if this is even real and not just made up by someone at the call center) is <Edited: Personal Information>.