Hi,
I switch from AT&T to Verzion last November. There is promption that is buying new iphone13 series and get trade in credit for you old phone. And I purchased iphone13 pro. The agent mentioned there is a $400 off if trade in my old iPhone 6. While I did not like iPhone 13 pro, so I returned and exchange to iphone13 within a week. And I did the trade-in my old iPhone 6 that time. However, the Verizon system showed the exchange from iPhone13 pro to iphone13 was a upgrade, and later trade-in value of my iPhone6 was only $10.
I called Verizon customer service several times, and no one can solve the problem. Hoping someone in here can help this issue. Thanks!