what do I need to do to schedule a service call where the tech will actually know what they are supposed to do?

It's a very simple request - I need a tech to go to my Dad's house (whose account I manage since he's 80+ and isn't capable himself).  All they need to do is install a freaking cable jack in the bedroom so that he's not paying $50/month for WiFi access when he doesn't use internet/Wifi.  The only reason he has it is so the main box in the living room can connect to the one in the bedroom so a huge waste of limited resources.  But Comcast has to be the most incompetent company in existence when it comes to customer service.  Attempt #1 - chatting with a live agent to schedule the service call - told them I was out of the country on the date so DON'T CALL ME, call my father.  Confirmed 3 times that was added to the ticket.  What's happens?  They try to call me while I'm out of the country and the phone is off, then cancel the service call when they can't reach me.

2nd attempt today - made it very clear to the agent what needed to be done and the # to call - she verified it was added to the request.  Tech shows up (calling him instead of me anyway - good) but has NO CLUE what he needs to do and, to boot, doesn't speak very much English.  The tech calls his supervisor and he also has no clue - can't you look at the request for God's sake?  I don't know what else to do here - that $50/month is way too much for a man on a fixed income when it's not something that is even wanted/needed.  How hard is it to just install a new jack?  More importantly, how hard is it to communicate within your own freaking company?  Someone from Comcast - please contact me.