Xfinity Technician Lies about services

My modem was not connecting to the internet. I unplugged and plugged back in as suggested by the app to troubleshoot. I would watch the lights on the modem go off and then on again once the modem was plugged in, but the internet not be restored. I scheduled a technician visit. The technician told me my system was out of date and replaced my modem. I pay monthly to rent my modem from Comcast. I did not expect a $100. When I inquired about this, they told me the technician had to fix my power outlet. Which is a lie. Bother the modem and my lap had been turning on from that power outlet. He said NOTHING to me about the power outlet. The power box wasn’t even opened to turn off power to that outlet for said “fixing”. I literally cannot believe this. Even if they waive the fee, how can I trust Comcast coming into my home again. Like I need a 3rd party witness next time I schedule a technician visit. Do I even want Comcast anymore after this. What a breach of trust.