Who I have the same questioned this topic

I recently purchased (9/25/2019) an Apple iPhone 11 online through Verizon.  I traded-in my Apple iPhone 7 as a part of the deal.  After receiving my new phone, I sent the iPhone 7 to Verizon using the provided UPS shipping label and box.  The traded-in phone was received by the Verizon Returns Center in Fort Worth, TX on 10/08/2019 (I have the tracking number from UPS to confirm this).  I continue to receive threatening emails from Verizon that I need to return my trade-in device or else.  I have tried to call multiple times to only wait for an hour with no answer.  I have also chatted with verizon reps and did not come to any conclusion.  It was almost be 2 months and i have become extremely frustrated.  I do not want to have my account charged back or start this process over again.  Anyone else having this problem? And can anyone at verizon please help me with this issue.