Charged for installation fee with no change in service or installation

After Xfinity forced me into a paying for greater bandwidth at the end of a promotion, their network reset resulted in frequent disconnections. I spent hours on the broken chat bot with customer service, which got me nowhere. They said they would send a technician out to diagnose the issue. I stated that I would only accept the service if there was no fee applied, because it was an issue of their making. I also asked whether I would be charged for the visit and whether the call was being recorded. They said no to the former and yes to the latter. On the day of the appointment, I stayed home from work. The technician never showed up and Xfinity did not respond to inquiries as to what happened. On the next billing cycle, I see a charge for a $100 installation fee. Since I clearly did not receive a service, this is either fraud or theft. It seems they ended up dropping the charge, but that does not justify the new hours I spent fighting them. I am extremely disappointed and will switch providers at the soonest opportunity.