Trade in devices lost by Xfinity Mobile

I decided to trade in my devices back in late November to take advantage of the $1100 trade-in offer. I shipped the devices back Via the labels provided to me by Xfinity Mobile through the United States Postal Service. I was able to track that those devices were delivered on December 16. After a week of no account activity, I called in and was assured by the reps that everything would be fine and my credits would be applied by my next bill. I was still persistent and called back every week. About a week and a half ago I finally got an agent on the line who discovered that while one of the devices was delivered on December 16 the other device was still showing in transit. The fact that the one device was delivered, doesn’t necessarily matter because Xfinity still does not have record of receiving or reviewing that device. I’ve been in lingo with no credits applied and have been pending a response from an escalated ticket for over a week and a half. This is absolutely absurd at this point. Luckily, I have my receipt showing that I shipped these devices and took photos of the phones going into the boxes. Dealing with phone support has been an absolute nightmare. I have spent hours of my time on the phone. I will likely never trade-in with Xfinity again. I’m actually debating leaving Xfinity altogether because of this. Hoping this can be resolved soon.