Modem not even connecting from 10a-5p. Onsite technician said there's nothing I can do

Starting on Monday, we would essentially lose connectivity from 10 am - 5 pm.  It may be on for spurts of 5-15 minutes, but otherwise, the modem is not even connecting.  I tried a new modem (in order to troubleshoot it myself because the support site threatened to charge me if the issue was my equipment).  Same issue.  The technician came out and said that I lived in a hot spot and that with everyone working from home, the node is completely saturated.  I asked them is there anyone I can talk to to help remedy the issue?  He said no.  I asked if there was any effort to improve the network?  He said no, I'll just have to wait until everyone starts going back to work.  The choice of ISPs here is almost nil, Comcast or AT&T DSL where I'm so far away from their node, my speeds are unacceptable (but 25 Mbit is better than 0).  I live in the Bay Area suburbs, work in Silicon Valley.  This can't be acceptable, even during the current situation.  I can't work from home when I have no internet at home.  Xfinity chat isn't getting me through to an agent and of course there's no number I can call.  If I don't get someone to seriously address my concerns by this weekend, I'm switching providers.