Disputed Xfinity Mobile debt sent to collections and damaging my credit

I need help with a serious billing and collections issue involving a closed Xfinity Mobile account.

Xfinity sent an alleged $435 debt to collections even though I disputed the charge repeatedly over the course of several years and was told by multiple Xfinity representatives that the balance would be removed. The charge involves two iPhones that were provided as part of a promotion, and I was specifically told when I signed up that I would never owe money for them.

I have also repeatedly tried to obtain the original chat records from the sales interaction and have not been provided them.

This disputed account has now been reported to the credit bureaus and my credit score has dropped by more than 100 points. I have been an Xfinity customer for nearly 10 years and I am extremely frustrated with how this has been handled.

I need this escalated to someone who can review the account history, previous notes and disputes, the original sales interaction, and the collection reporting. Please have an Xfinity representative contact me through private messaging so I can provide the account details.