Home Security: Failure!

I am a current Xfinity customer with Home Security on my account since 2018. Beginning in 2020 we began to experience a slow decline in accessibility to associated services. Initially, connection lost via internet. A technician visited my home for service. He advised that due to Covid restrictions, he was unable to resolve my issue, but reassured me that the cellular connection still provided security service. Overtime cellular connectivity dropped and the app stopped working. Our touch screen has also failed: No connectivity, randomly beeps when doors or windows have not been opened/closed, incorrect time display. With no access to user settings we are further inconvenienced by the inability to modify the auto arm/disarm schedule. The time parameters of our preset schedule and the touchscreens inaccurate time display now override my hardwired keypads making the entire system inoperable. 

I have tried to resolve this issue through Customer Service on numerous occasions without success. Given that I'm paying monthly for a service that I'm not currently able to use properly, I am kindly requesting to speak with a supervisor for a suitable resolution.