How do I file a complaint with comcast/xfinity

I was charged $100.00 last bill, actually my bill increased $113.10 not $100.00, because a technician came to my home after repeated refresh attempts did not work.

the technician had to replace some of your equipment that was not working, and I was charged to replace your equipment that was not working.

This is about my last straw with Comcast/Xfinity.

overpriced, repeated outages on MLBXtrainnings throughout the season, no rebate for lost service periods, etc. 
Charged to have someone repair your defective/non working equipment when repeated refresh did not fix the problem after repeated outages.

Fubo, etc., and AT&T Internet which is faster and cheaper is looking like a very good deal after Baseball Regular Season ends on 1 October 2023.