Formal Complaint - Misinformation, Poor Communication & Erroneous Debt Collection

I have never been more frustrated. This has been going on for three months, with ZERO resolution, despite multiple attempts and false promises from Xfinity. 

I cancelled my contract in June 2025. Suddenly I receive a nasty letter from Harris and Harris regarding an outstanding bill due ($61.99). Both surprised and alarmed, I quickly got in touch with Xfinity to ask 'what [Edited: "Language"] is going on' - they explained that this should not have occurred and that my account is in full credit as of September 8th. I triple checked to ensure nothing was outstanding, and I got confirmation from a Xfinity Live Agent that my 'charges have been waived', and a Support Agent via X confirming the same. 

A month later, I receive another letter from Harris and Harris, saying that I am still outstanding on a payment, and that my credit rating could now be affected - to my dismay, anger and frustrating, I called Xfinity again, a total of three phone calls, totaling 4 hours, speaking to various agents, who all gave me conflicting information. I have been rerouted several times and passed around to different departments for three months (and counting...). Until finally, I was passed over to Natasha from the Collections team, who understood my concern, spoke to her supervisor, quoted the following Confirmation ID: ECM [Edited: "Personal Information"], confirming that my account was fully credited and that my name should not have been flagged to Harris and Harris. She then advised me to call H&H, and inform them of this, so that they may call Xfinity/Comcast for verification, in order to (finally) get me off this 'naughty list'. I did, and unsurprisingly, was told that Xfinity/Comcast should make the call to Harris and Harris to get 'my name off the list'...

I try painstakingly to advise a number of Xfinity agents yesterday of the above (which is quite simply, someone from Xfinity Collections need to contact Harris and Harris to get me off the list, as I have nothing outstanding), yet none of them seemed to understand what I was saying. They were being difficult, unreasonable and downright dismissive. I have been assured that there are notes on my file, yet I had to keep repeating my entire three month case. I have evidence of three agents confirming my waived charges, yet none of the agents provided me with any avenue to provide these over to them.

I am now at my wits end - I would like to raise an official / formal complaint about how I have been treated these last few months, and the fact that without my consent or knowledge, I have been flagged to an external debt collector, which can severely affect my credit rating (again, when I had no outstanding bill communicated to me) - this is gross negligence on your part and I want to take this up to senior management. 

This has been one of the worst experiences of my life and sadly, as of today, this is still not resolved. 

I have had 5 tickets opened (and then closed within seconds), numerous phone calls lasting 5-6 hours, screenshots and evidence of my bill being credited yet nobody has resolved this with Harris and Harris. 

Someone needs to resolve this asap (because this is escalating into a litigious matter). 

[Edited: "Personal Information"]