Support awful Tech no showed and new cable boxes blew my tv Days ago

I called support last week when told we had to get new cable boxes.  Plugged all in properly and upon turning our Beautiful LG 65" TV on it fried. Called Comcast the rep told me coincidence, the tv is fine. The other TV in another room started freezing up, the rep told me no it is fine. We then tried connecting a SMALLER tv we had to the new cable box, worked for an hour and then that stopped working. Called Comcast again, Spoke with Leo he said oh the cable box is having issues uploading software, a known problem, will send tech on site for Friday. I asked for sooner and was told nothing. I asked for a supervisor and was given David, during this time I also received a text from Xfinity saying we are paying $100 installation charge for tech coming on site. David told me no worries that the issue is known and he guarantees me no charge and he will note on my file. Promised me a credit to my account for no TV for 7 days and sending tech to evaluate how much Xfinity should reimburse for the fried TV AND he would have a tech out Wednesday between 4 and 6. I asked for new ticket number and he gave me one. I said no "CR" in front of it and he said no because Special request. All of this took 2 1/2 hours. Today is Wednesday at 7:41 and no tech ever showed. Received a call confirming Friday 8 am and we said no it was supposed to be today. I called back in and have spent another hour with Lyn who said there is no records of the call ever even occurred. No appt scheduled until Friday. Everything I was promised by the Supervisor David was never documented. So now, no cable, no TV(s), 7 days, No tech showed and lied to. Unbelievable and I can't get an solid human to help.