Porting out line doesn't work

Hi all, 

I have been trying to port out my number to a different carrier. However, it has been a really draining experience for me. It's a nightmare.

I have been trying to port out one line for a month and all my porting request were rejected by Xfinity because of mismatched customer information. I called Xfinity mobile customer services at least five times and had several conference calls with the new carrier as well. All representatives said that information are correct and the phone is unlocked, but the porting out request always says customer information mismatch. I requested a manual release for several times. All Xfinity representatives somehow just ignored my request and only checked for customer information over and over again.  Once they realized that all information are correct, they just either hang up the phone or told me that they don't have permission to manually release the line. Nobody from Xfinity knew which information was mismatched, and I can't do anything with my number. It seems like if I can't port out my number, I have to keep using Xfinity for the rest of my life because nobody in Xfinity mobile service has the permission to release my line and they can't find anything wrong with the porting request. Does anyone have suggestions what I should do next?