3 techs and still having lag

So 3 techs showed up to fix my issue but the issue never went away the 3rd tech showed up saying everything was working and fix the issues with the router then a random outage happen in our area to fix the current problem okay I was hoping to get it fix like the next day it took 3 flipping days for them to start working on it and only took them like an hour to fix but going back to my internet the lag and packet loss are still their bruh 3 techs could solve the problem to fix my internet problems why is that