Xfinity series very bad

Xfinity sent us a new router. It won't work and Internet is out for 4 days. They schedule a technician with a 2 hour window as if we have so much time to wait for them all day leaving all our work. Then they msg the technician is arriving at exactly this time and the technician does not arrive at that time. Again they say ohh no they will arrive between 2-4. Then why did u msg they will arrive at 1.32pm? Very bad service from Xfinity