STB malfunctioning

After a large area outage of 5 hours cable finally came back.  Other of my boxes came back but main cable box did not. Multiple reboots, nothing. Tried help bot, nothing.  Finally got customer service.  They sent reset signals,  nothing worked. Replaced STB at Xfinity store. Now no boxes work. Can't get a tech out for a week. I have been a customer for many years with most expensive service, but can get NO assistance. What else can I do?