Ongoing Billing Issue on Closed Account

I'm hoping someone can help or point me in the right direction. I’ve been dealing with a frustrating billing issue for several months now, even after canceling my Xfinity Mobile service.

Here’s a summary of what happened:

• My monthly mobile bill was $22.07.

• In November 2024, my credit card had a security breach and was replaced, so the November payment didn’t go through.

• Before the December 2024 billing cycle, I updated my card, and on December 16, 2024, I made three payments:

  1. $22.07 – Regular December bill

  2. $44.07 – To cover the missed November payment and an advance payment for January 2025

• I canceled and ported my mobile service on January 13, 2025.

• Then in February 2025, I was unexpectedly charged $22.03. I spoke with a billing agent named Sydney (ID: 4263945) on Feb 3, who reviewed my account, reversed the charge, confirmed the account was closed with no outstanding balance, and said I wouldn't be billed again.

Despite that, I’ve continued receiving monthly bills. I called again in March, and they said it would be resolved—but I’ve now received a new bill for $27.03.

To make it worse, I got a call from a collection agency about this amount. I explained the whole situation to them, but the issue remains unresolved. I’m very concerned this might negatively affect my credit, even though I already paid what was owed.

I have receipts for all 3 payments I made in December 2024. This has been ongoing for months and I’d really appreciate if someone from Xfinity could finally resolve this.

Thanks in advance for your help!