NO INTERNET CONNECTIVITY AND SLOW NETWORK

WIFI ROUTER HAS NO INTERNET CONNECTIVITY SINCE EARLY MORNING, YESTERDAY THEY CAME TO FIX IT AMD IT WAS WORK UNTIL EARLY AM TODAY. NOW IT'S NOT WORK THE INTERNET IS EITHER SLOW OR NOT CONNECTION AT ALL. THE ROUTER IS NOT FLASHING A RED LOS LIGHT, BUT THE GREEN INTERNET LIGHT IS OFF AND NOT FLASHING. I WORK FROM HOME AND NEED STABLE WIFI YOUR ASSISTANCE WILL BE HIGH APPRECIATED.