do it yourself set up easy to go bad and waste money and time

dont get me wrong im sure it is easy for those living in newer homes, my condo is a little outdated. so are the outlet cables... but i never had a modem set on coaxal to know i would have issues thought i could just find one of 5 i have in my home and be working from home with no issue... till the gateway came in and the lights blink mind you i plugged in the cable first before plugging in my router. It prompted me to set up through the app takes 5 min per outlet.... none work i just have blinking white lights I now know i need someone to come and fix one of the cable outlets, scheduled for someone to come out today, not one person showed it was for between 1-3 at 1 i got a text saying someone would come out tomorrow same time... im beyond irate, im going to be mad if they charge me more for the issue especially if its something i can fix with out needing someone here. also working from home needing strong internet is not going to be a good time since i work at 3 i keep trying to reset i called to make sure support will come tomorrow and i get on my computer it says no tech is available in my area... im not wanting to pay if someones not fixing and getting my network to work  by end of day tomorrow