Router keeps rebooting and no support from Vodacom

Vodacom fiber is useless, the router works for a few days then reboots on its own for a few hours. I logged tickets via the app then get an sms telling me to contact the call center. The call center then has to escalate it by that time the wifi works again, the next time it happens I follow the troubleshooting steps I did previously with the call center agent, I log a ticket on the app then get an sms telling me to contact the call center. No one helps, I have this problem for a few weeks now.