Trade in credits never being applied

I have 3 phone trade-ins on our account that have never received credit, one dating back to January of 2022. I have chatted with customer service twice on this and had 2 separate tickets that have supposedly been resolved, but the credits have still never started showing up. I have spent way to much time already trying to get this resolved, but this is $2400 in credits over the next several months that I am loosing. Not very happy with any part of customer service at AT&T right now. Anyone know how to talk to someone that can get something done? Thank you!!