Keep getting cancelled cases with no resolve and they totally messed up my account so I can't use it.

I just got a new iPhone to add to my account and it was financed through Xfinity. I ported my old phone number to a different carrier and so there was problems activating the phone I just purchased through Xfinity. The chat activated my financed phone as a BYOP which created 2 phones and 2 lines of service which were actually the SAME phone. I had one of the clone lines discontinued. When I contacted Xfinity again about the issue, They wanted to clone my phone yet again! As of today I have a brick of a new phone because it cannot be activated. I asked if I could just return the phone and cancel all my Xfinity Mobile and was given a support ticket and told I would get a shipping label sent to my email. Within 5 minutes I get a text saying my case has been closed. I tried to call and talk to a supervisor, but they disconnected me again. At this point I think my only recourse is legal action because I am being charged for a phone that. does not work. This is infuriating and I have wasted countless hours on this!