They broke my trade in phone so they didn’t have to give me the credit

I’ve had nothing but problems since I switched to Xfinity mobile. The chatty on top is when I sent my old phone as a trade in & received it back in the mail FOUR WEEKS KATER ABSOLUTELY SMASHED. I packaged it PROPERLY. I was supposed to get a $500 credit!!!!! Never got an email saying the condition on the phone like I was supposed to!!!!! XFINITY MOBILE IS CORRUPT & A SCAM!!!!