T-Mobile is running a phone trade in scam.

I have had such an awful experience trying to solve this lost trade in phone issue that I am just utterly frustrated and angry with customer service.  I have PROOF the phone was delivered, even the customer service representative admitted they have it, but I can’t get credit for it.   I have been lied to, ignored, I don’t feel like a long time valued customer with T-Mobile, quite the opposite.  In my opinion they are without a doubt the worst customer service I have ever experienced.  I am still out my $300 trade in.  Knowing what I know now I will NEVER trade in a phone with T-Mobile again, just a horrible experience.