17th Nov 2018 - Purchased iPhone XR in Costco - T Mobile
23rd Nov 2018 - Shipped old Phone iPhone 6s
25th Nov 2018 - Submitted Rebate using new phone number and with code COSTCO APPLE
26th Nov 2018 - Old phone USPS tracking shows Delivered.
15th Dec 2018 - Received a message from T Mobile saying, "In order to receive rebate, trade in the phone" which I have done already and tracking shows delivered on 26th nov 2018.
15th Dec 2018 - Called T Mobile they submitted a handset tracking/research request.
This is a big hassle, not sure what to do. 17th Dec 2018 is last day to trade in it seems.
Best answer by tmo_amanda
I'm sorry for the confusion,