Tv pixilating after xfinity work

I’ve had to deal with connections issues all week. I did have a notification that xfinity crew would be in my neighborhood on Monday to upgrade the network. Monday turned into Tues wed and Thurs. Very frustrating as I work from home. Anyway my issue is my tv is pixelating after this so called upgrade. I am sick of the chatbot telling me to reboot. I’ve done that MANY times. Then they say check you hdmi cable. That’s not it! If I could actually talk to a real person at xfinity it would be very much appreciated. We pay way too much for xfinity to have pixelating tv from low signal after  so called network upgrade!