Xfinity Mobile Repeated eSIM Failures and Unresolved Billing Dispute

I have spent months trying to resolve an issue with my Xfinity Mobile iPad service. The issue was that the iPad's eSIM repeatedly stopped working, causing it to lose cellular service. I spent many hours on the phone with Xfinity support, made multiple trips to Xfinity stores, and even went to Apple for help. Apple replaced the iPad once, but about a week later the exact same issue happened again. I went back to Apple, but they told me they could not find anything wrong with the iPad and instructed me to go back to Comcast. Since Comcast still could not figure out what was wrong and fix the issue, I felt I had no choice but to file an insurance claim and pay a deductible to receive another replacement iPad, which I should never have had to do if Comcast had fixed the problem. About another week later, the exact same eSIM issue happened again on that replacement as well.
After everything I went through trying to get this issue fixed, I got fed up, switched carriers, and returned the iPad. Comcast credited the remaining iPad balance but is still attempting to collect $161.20 in service charges.
I first worked with Comcast Executive Escalations, then filed a BBB complaint. Comcast responded that the remaining balance was for post-bankruptcy service charges, that the iPad balance had already been credited, and that no additional billing adjustments were warranted. I rejected that response because it did not address the repeated unresolved eSIM/service issues or the insurance deductible I should never have had to pay.
I then filed an FCC complaint. After that, I received another call from Executive Escalations. I explained everything all over again, but I was again told that because the charges were outside their 120-day dispute window, nothing more could be done. When I said I intended to continue escalating the matter until it was resolved, I was told they would simply keep calling me and explaining the same thing again.
I understand Comcast has a 120-day dispute policy in its customer agreement. However, I believe the repeated unresolved service issues, the many hours I spent trying to get them fixed, the multiple unsuccessful repair and replacement attempts, and the insurance deductible I had to pay deserve more than simply being told it is too late.
This is not how a company should treat a customer who repeatedly tried to work through the proper channels to resolve a recurring service problem. I am asking Comcast to take another look at my case, remove the remaining $161.20 balance, and reimburse the insurance deductible that I should never have had to pay if Comcast had fixed the problem.