I have had 4 appointments where the installer did not show up

I am so frustrated. I had a technician come last Friday to install my new service (actually I moved, transferred service, and have been an Xfinity customer for over a year). He didn’t have the “fiber” equipment and said a technician would be out the next day, Saturday from 1-3pm. I called to confirm the morning of and they told me my appointment was actually from 2-4pm. I waited all day and no one showed up. I called that evening and they scheduled installation for the next day, Sunday evening. No one showed up on Sunday. I called Sunday evening and they said the first available appointment was Thursday, September 9… today. I called last night to confirm and they said a tech would be here between 10:00am and 12:00 pm. Guess what? No one showed up. I am at my wits end. Part of my job requires I work form home. I cannot move into the home I just purchased until I have WiFi. I am beyond frustrated. I have tried everything… called customer service, talked to supervisors who said they would call me back but never did, called tech support… no internet… no cable. I don’t know where else to go. I have a ticket number and a tech number that was given to me last night. Please help me!