Assurant shipped four phones, Xfinity Mobile couldn't activate any of them. Stuck in a loop now

The worst customer service experience I have ever had in my entire life. 
This started in November 2024. Still not resolved. Five phones in (one that was accidentally accepted under the impression that it was a solution, but actually a new phone on payments). 
Each A14 phone shipped by Assurant could not be activated. After hours upon hours, many agents, and over months, they could not get the phones activated. 

Something is wrong between Assurant's replacement A14's and Xfinity's activation process. Today's chat resulted in agent claiming "supervisor" disconnected the chat still missing the point and still saying to go back to Assurant. What are the odds that this is all on Assurant? Is there a record of them shipping out bad phones? 

Now it appears we lost the number and the insurance due to the confusing actions of the agent that led me to believe we had a better solution. 

Four phones were shipped and not a single one was activated. They couldn't figure out how to assign the new sims to the new phones. 

Very disappointed. We are stuck with a problem and a waste of insurance payments, and now stuck with a new phone and new payments only without insurance etc. 

We need supervisors and managers to communicate with Assurant and figure out what happened.