In-Home Service Visit Fee Dispute

We've had internet connectivity issues for a long time -- eventually, the Xfinity Assistant suggested scheduling a technician visit.

So we had a technician visit on July 15, and he said that our in-home equipment was fully operational and not causing the issue.  He said that the signal strength was very weak and that if the issue persisted, it would have to be dealt with at the telephone pole.

After he left, our internet was dropping out again within a couple of hours -- and after a few days, the Xfinity Assistant suggested scheduling another technician.

The second visit was on July 24, and no technician entered our home -- just worked at the telephone pole -- internet connectivity has been fantastic since then.

I was charged a $100 "In-Home Service Visit" fee on July 17, and have been disputing this fee (via online chat) with Xfinity agents over the past few days.  Three escalation tickets have been created for a $100 credit and they have all been closed with no explanation.  None of the agents can tell me the reasoning.  Which makes sense.....because there's no good reason to deny the credit!  The tech for the in-home visit couldn't do anything to solve the problem!  He just came in and told us that our in-home equipment was functioning fine, and that the problem was upstream.  I shouldn't be charged for an issue with defective network facilities in the public right-of-way that had to be replaced.

Please help.