Early termination fee waive

I canceled service when I moved to an area that doesn't accept xfinity anymore in April of 2025. I got a bill for early termination fee of $130, which I called about and the agent assured me they would waive. Suddenly in June 2026 I'm notified that my debt has been sent to a collector. I called Xfinity and the agent spoke with management and told me they would waive it. Now it's October and I got a text that my debt has been sold to a new collection agency, and this time Xfinity agent told me they cannot waive the debt and there is nothing they can do for me, despite both previous times I called they told me they would waive it.