Did an upgrade and opted for the trade in of my iPhone X.  
 

received it back saying I hadn’t unlocked it properly.  Did the unlock and sent it back.  Now received the phone back  again with a small label on saying non working - no diag.  
nothing else.  No notification or explaination.  Phone was fine, in daily use and in good condition before I upgraded.  
well hacked off with these guys.  feel like I’ve been ripped off and tempted into an upgrade I should probably not have done.  Is there any point in going to my local Curry’s store?