Trade in

I ordered a new phone in August, which was the flip z6. Somehow Xfinity sent it to my old home. Never got it and had to be sent back to xfinity warehouse. I then went directly to the store and purchased galaxy s24 with the offer to trade in my iphone 11 pro max for $600. I sent it as I was instructed.  I got notification of when my phone was deliever to xfinity whi h was Aug 26th. Since then I have not got my credit, my account it showing it's now too late for the trade in. I have called xfinity over 10x and each time being told something different, but to relax and things will be sorted.  I've gone to the store, where I'm told they had less power then customer service directly. I'm refused the chance to speak to a manager. My claims keep getting closed and then new ones re-open. I despise how this company is treating me after four years, with them and giving them thousands of dollars and never late on any bills. At this point I feel like i'm being robbed of my own money and honestly, it seems really shady how this company works. I've called assurant and they tell me they don't actually do anything and have no power. Somehow, I now don't have my old phone or the $600 trade in. I am beyond furious with how I'm treated every time I'm on the phone. Or the mobile app chat. I'm being told something different every time. The most recent call I threatened to being legal actions and the guy still refused to let me speak to a manager.  He re-opened a claim and told me I would get an email shortly so I can upload all the data I have with proof of delivery.  Never got that email. This company is a joke and at this point I don't know what to do, other then close all my accounts with them. It just seems like a shady scheme, to get people to spend more but not get anything back in return.