xfinity network congestion

My 1 gig plan speed drops down to 5mbps between 7-11 pm nightly and that's on all devices with Ethernet and Wi-Fi after 11pm speed returns on all devices back to 946mbps. Have restarted the modem multiple times and check routers and ran tests and rebooted. Attempted to contact a support rep only to have AI send me into a loop claiming the modem has to be restarted for a tech to schedule an appointment. Since then I have been getting no cooperation with xfinity in this situation to reach a live rep after exhausting all means of Chabot’s and phone bots. Since I just signed up for this plan and believe I’m not getting the service I paid for. My only option is to document all this information and file a formal complaint with the Federal Trade Commission so they can start and outside investigation into this. I have all screenshots from speed tests also dated callbacks that never happened. also the one rep in that did reach out earlier acknowledge that it was on xfinity’s end and said they would call back but never did sense then  AI has blocked all my attempts  to reach a live rep or schedule a service appointment. Not sure what's going on with this company. Not only did they not honor the down load speed agreement but also didn't honor 1 GIG peacock packaged. This post will be added to that complaint along with other backup supporting the lack of effort to address this problem.