My Horrible Experience with Xfinity Device Purchase

This will be a really long post as there have been multiple turns of events, but this is my final attempt at trying to reach out the right person and get a final solution. If I can't, then I will have to seek my lawyer's support. So, following are the major things that happened:

• I ordered 2 new phones (Iphone 15 pro and 15 pro max) for me and my wife, along with 2 new lines; we wanted to switch from other providers keeping our numbers. I placed my orders through chat support. I was promised that I would get the delivery within 2 business days.
• I didnot get within 2 business days, but that's fine. What was not fine is I was promised during the order that I would get so; I contacted support multiple times throughout the days and all of made promises but none were true.
• Finally, one day, I got my tracking info and I was so happy! I was eagerly waiting for my delivery to come.
• The delivery came. But the package was empty with no phones inside!!! I immediately contacted xfinity, and since then my real struggle started.
• Just to add something important: both my wife and I were supposed to trade in our current devices and we were told we would get $700 for my phone and $830 for my wife's phone. 
• So, back to the missing content in the package: I immediately contacted xfinity and they took note of the issue, opened a case and I was supposed to get an update by 48 hours.
• But that 48 hour promise truned into like a month!!! In the meantime, I had contacted Xfinity numerous times, like literally numerous times. Multiple tikctes were opened, promises were made, but none kept. 
• After numerous times, one agent told me to file a police report, which I did. But they could have communicated to me in the beginning, right! not after waiting 20+ days?! But whatever, I filed the report and then shared, a shipping claim was filed.
• Forgot to mention: in the meantime, my wife got her phone delivered properly. She activated her line and submitted her trade in in time.
• I asked multiple times about my trade in deadline. Multiple agents promised me multiple times that the trade in wouldn't be a problem and once I receive my device, I would be able to submit my trade inn to get the original deal of $700.
• So, after following up multiple times on my shipping claim, finally I was told that I would get my refund and I would have to reorder to get my device.
• I called and submitted my order again at once. I asked multiple times if I was going to receive the $700 credit for my trade in, and the agent confirmed multiple times. Thus I felt assured and comfortable and reordered the same device for the same deal I originally wanted.
• But then, I didn't get any trade in instructions. In the meantime, I got my phone delivered and activated right away. As I hadn't received my trade in instructions, I contacted them. And to my utter surprise, they said that my trade in wasn't included in the order!!!!!!!!
• Then again my struggle started. Contacted them many items, spent hours in calls. Talked to many agents and everytime, I had to start from the very beginning. And I got confusing responses from different people. 
• Some told me to go to the nearest retail location, some told me that I wouldn't get the offer now, some offered me $180 for the trade in, some said the only solution was to return my phone and reorder and get $600 (returning and reordering makes absolutely no sense, neither for me nor for xfinnity as well due to the added costs to them, righ!!)
• Since then, nobody could offer me any solution that could allow me to submit my trade in for the original deal I was promised many times. I am fed up, I can;t deal with 1st level agents anymore as they can't change anything on the trade in offer or provide me a solution. 
• I am pretty sure, xfinity has in call/chat records all the promises and mistakes their agents made. So, this is my last attempt. If not succefsul, I am going to lawyer.