Xfinity mobile [Edited]

I have been dealing with a trade in issue since 10/10.  I have called 13 times and have spoken with representatives and supervisors and I either get hung up on or they "escalate" the issue, but I never hear any resolution.  I have asked numerous times to be transferred stateside and am told that it is random, and they cannot transfer me to a US representative. Anyway, i traded in 5 iPhone (2 iPhone 11 and 3 iPhone 13) and have received notification on 4 that the trade in has been processed and my bill has been credited.  However, the very first phone sent in was an iPhone 11 and I received an email saying the trade in has been cancelled.  I cannot get anyone to explain why or where my old phone is.  I was told to called Assurant. I can't get passed the automated system as its not recognizing my phone number as a claim.  No one from Xfinity can help as they say they can't do anything until its updated from Assurant.  So, I am stuck in this hamster wheel with no help.

I have been a customer for 25 plus years but transferring to the mobile service was the worst mistake I ever made. I want to know where my iPhone 11 IMEI 352906119919910 is!!!!!!!!!!!!!!!