Assurant trade in

In October 2024, I purchased a new iPhone 16 pro max. There was a $200 off Xfinity rewards offer so I took advantage of it. It also said I can send my phone in for a check in the mai. I was offered $350. I submitted for the credit/check. I did not receive a shipping label right away so I went into a store and they had one emailed. I shipped the device as soon as I got the label. The package was received 2 days later. I was told later on could take 3 weeks to get the check. It has been over month and a half. Spent  1 1/2 hour on phone with support. The person could not find any info about this. I gave him the RMA # and asked him to look up the original order transcription. Eventually, I was instructed by chat to call Assurant (the company handling the trade-ins) “Please contact the Assurant team at 1-855-884-9771. They will surely assist you with the details.”  I called the number and it seems that it’s for the mobile care/claims. I was told by the Assurant person, that I need to talk to Xfinity about it and he transferred me to Xfinity. Now I feel like I’m getting the run around and I am out my device or $$$ I was offered.  Anyone figure out how to track with assurance? Xfinity support unless it looks like. I even asked for supervisor to escalate.