BIlled $100 for Professional Install fee

I placed a service call due to service intermittent drops and a final no service status.  Comcast technician came to my house due to service failure which phone agents said was due to a very weak signal coming to the house/modem.  When the technician arrived, he wanted to come inside the house but I repeated what the phone agents had said so he said he would check the signal outside first, from the cable box by the street to my house.  He quickly determined that the signal was awful and confirmed it was the cause of the problem.  I said that the cable from the box by the street to my house would have to be replaced.  He placed a temporary cable from my outside connection to the box by the street.  My service was immediately up and running.  The technician then left.  He never entered my home, never installed or inspected my equipment, and never provided "education", as this was due to the failure of Comcast's equipment/cable/etc.   I did not have ANY "professional installation" for my service.  I had a Repair of Comcast underground cable only.  (By the way, the crew who "buried" the cable did not do a very good job; they only put the cable and "sheath" a very few inches below the surface and left it just visible in areas, creating a trip hazard especially after a rain washed the dirt away.)   Over the years, Comcast has had to replace the underground cable a couple of times, due to the same problem - intermittent then total service signal failure.  I have never been charged a fee for this.  Please correct my bill quickly to deduct the $100 Professional Installation fee.