Xfinity Mobile - Credit check issue

I have been with xfinity mobile / internet since May 2021.  Pay bills on time and have 800+ credit score.  Tyring to upgrade my device on a monthly payment plan but not allowed to and being asked to pay for the device in full.  Tried to do it online and 5 different customer service representatives tried to help and I even visited the xfinity store, but no resolution.  Finally, one of the rep indicated that my credit limit is set to zero with xfinity.  There is nothing they could do as it is an automated process that runs every month and revises the credit limit based on the credit check and monthly bill payment. 

I have tried to upgrade my device numerous time since Feb 2022 (thats almost a year).  So, the monthly process to update my credit limit is either broken or the rep was just trying to close the conversation with me.

What ever it is, it is very annoying that no one can really help or fix the problem.  In this day and age, it just sounds silly that you cannot run a credit check on demand.  I just got passed over from one rep and another same rep in the name of escalating the issue higher.

Posting it here to see if someone has a solution.