Fee for service call

I recently reported an outage and the outage is now cleared up. Despite this, the Xfinity technician identified errors on my cable box and scheduled a technician to come to my home tomorrow. I received a notice tonight that refers to this visit as a new order and that I would be charged $100 fee for a professional install. I don’t believe this is appropriate for clearing up a service outage. I would prefer to cancel the visit than to pay the hundred dollars.  Can you help me?  I have gotten nowhere after 20-30 minutes dealing with your bot.