Black Listed IMEI for Xfinity

The Xfinity agent told me that my iPhone was damaged, he reported it on BlackList to offer me to buy a new one, after I discovered his move, I confronted him, he told me that Xfinity does not place them on BlackList, I checked several pages, and they all say which was reported by Xfinity.

Xfinity placed my iPhone SE on BlackList, I requested many times that they be removed from the blacklist because because it already works, now I cannot use them with any operator, they do not resolve, they do not respond to my messages, I went to the store and they tell me to enter contact by chat support, chat support sends me to phone support, phone support sends me to the store; I'm writing here to see if anyone can review and remove the blacklis.

IMEI [Edited: "Personal Information"]