Terrible Customer Service

I purchased a pixel XL pro 9 phone for my account back in June. I had to call customer service to have the phone activated and for them to swap out my pixel 8 that was on the account. The actual phone worked for about 3 weeks before all the sudden it lost all service. I had to end up calling customer service to ask them to restore service to my phone. The customer service rep tried but ended up telling me I had to go to the Xfinity store and they would be able to assist me. I just take a half a day off of work to go down to the Xfinity store which I ended up spending 4 hours down there for them to finally get my phone to start working again. At that point I was happy until about 3 hours later and my phone lost service again. I ended up calling customer service back and they said there was nothing they could do. I had to take it back to the store the next day. I had to call off of work the next day go back to the store, spend about 5 hours at the store for them to finally say there was nothing that they could do and I had to contact customer service again. At that point I escalated this to the corporate office in which they said they will assign a case manager to my account and she would be able to resolve any issues that I had. After 2 days of waiting the case manager call she was able to restore service to my phone and I also told her about an issue I had with an old pixel watch that was still listed on my account even though I returned it over a month ago. The case manager said she would resolve all issues and call me back after the weekend, well that was 3 weeks ago. Never a call or anything. Ended up calling corporate again to not only complain about the case manager but to also get the issue resolved. They said they would contact the case manager and have her call me. Well. It's been another week. No calls, no resolutions or anything. Since the issue occurred. I can't make any changes to that phone line on my account. If I try to swap it out with another phone it just fails. I have another pixel watch that I've been trying to activate but I can't activate it because it's still showing that there's another pixel watch assigned to my account. This has been the most frustrating customer service experience I have ever experienced in my life. At this point I'm not sure if I should just switch to T-Mobile or another service or what I can do because the case manager refuses to call me back to resolve the issue. If I take my phones IMEI number and enter it into the T-Mobile site, it shows that the phone is a pixel 9 XL pro and not a pixel 8. Not sure what Xfinity has done but obviously it's something that they can't resolve.