Xfinity keeps coming after me for a wrongful charge already resolved multiple times

I talked to an Xfinity chat agent on  9/24/2025 to cut off my internet service on 10/18/2025.

They reassured me there would be no more charges after that date after I pay a prorated amount, which I did.

In November, I got an email about an overdue bill, so I got on a call with Retention in December. The woman on the line apologized to me several times, saying this is indeed a wrongful charge and that I don't have to worry about it anymore. She helped backdate my deactivation to 10/18/2025 and provided me with a 'work order #'.

Then in January, I get ANOTHER email about the charge which had snowballed in amount, AND I start getting calls from the debt collector.

I talk to another chat agent on Xfinity, who reassures me they took care of the wrongful charge and to resolve the debt collection error.

Fast forward to this month, I get ANOTHER email about the charge.
So I call Xfinity yet again during my work hours in the office.

This time to my shock, the person on the line says I DO have to pay because my service was never deactivated, when it was supposed to be on 10/18/2025.

I tell her everything that had occured since last year but she insists. I ask for her supervisor, and she tells me they will call right after I hang up.

They never did. After spending an hour on the call, I am back to square zero.

This nightmare just keeps going and going and I'm convinced they will come after me until the day I die, all because they forgot to deactivate the service on time.

Nobody was even living at this address from Oct 18 to beginning of December last year, that's why I had ended the service, and then another family member started a new service & account at this address at the beginning of December.

Please, for the love of god, can someone please do me a favor and put an end to this?

I have transcripts and screenshots from these interactions, including the initial chat where the Xfinity agent assured me of the deactivation date of 10/18/2025, and reassured me that I don't have to pay anything more after the prorated amount which I paid.