Cable Modem lost connection to Xfinity service

I've been having intermittent connection failures between my modem and Xfinity service for about 6 days.  Last night, my internet service failed completely and will not connect to Xfinity.   Spoke with tech support and they won't help me.  They only want me to agree to a plan change and rent Xfinity hardware.  No outages or maintenance is in my area.  I own my modem and don't want Xfinity hardware,  Its been an infuriating process with support.  I've replaced my cables, completed all the troubleshooting steps available from the Xfintiy support pages and that AI chatbot thing.

I need to speak with a technical support representative in the united states.  Not the outsourced tech support teams in India or an AI Chatbot.  When ever I call, I'm transferred to that overseas support center.  Each representative immediately tells me my modem is not an Xfinity modem and that I need to rent Xfinity hardware.  Their tactics are overly aggressive and weird.   They won't answer my questions, they have no idea what I'm talking about and are lying to me about errors that do not exist on my modem event logs.

6 days of the same sales tactics from support.  I'm not a paranoid person but I'm starting to think that Xfinity is sabotaging my internet connection in order to get me to rent their hardware and change my plan.

I was able to schedule a tech visit from the Xfinity website, but even that was a [Edited: Language] to find.   

Also, the support reps told me that If I don't have an Xfinity modem I would be charged 100.00 for the tech visit.   [Edited: Language]?!   I don't understand what's happening.

If anyone has a US number with competent tech support, it would be greatly appreciated.