I've asked a Comcast employee to help you. You should expect a reply in this thread.
Sorry to hear about the experience you're having trying to get this block removed. I can help you get this taken care of. Since I will need to gather some sensitive information that shouldn't be shared in a public thread can you please reach out in a private message? To send a private message click on my name "ComcastChe", then click private message me. In the body of this message please verify your first and last name, the phone number, street address including city state and zip code, and the full account number or phone number associated with your services and we can start there.
Did you respond to @ComcastChe?
I provided the documents you sent me to the collections department. At this time, we are still waiting for an update which is why I haven't reached out to provide one. I apologize for the miscommunication on my end. I am going to reach out to see if I can get any more information an will be in touch soon.