"Billable Service Call" on my bill for Cox's faulty equipment???!!!

I recently reported slow, unreliable Internet connection to Cox, who cheerfully set up a service appointment (without mentioning the possibility that we would be charged for the visit) to have a tech come out to our house. The tech told my husband that the problem was "probably upstream," in the "feeder system," but that our cable connector was "200 years old" and needed replacing.  He replaced the connector, and left without mentioning any fee for the call.  My latest cable bill shows that I am being billed for this "billable service call."  To the tune of about $60.  For real, Cox?  Your "feeder system" can't meet local demand, and your outdated 10-year old equipment fails, and somehow that's MY problem?   Cox's customer service leaves a lot to be desired.  They will find a way to stick it to the customer, one way or another.