Horrible internet speed for many months

I have the gigabit plan and my speeds are horrendous. My internet is nonfunctional for entire days, or for many hours during the day. I've already had 3 techs come over and replace stuff outside of my house. I've already changed modem and routers, the issue is clearly not on my end. Restarting my devices, modem, and router has not helped at all, in fact if I do so I lose connection for a few hours. The chat bot is not helpful at all, and my issue has already been escalated many times. One of the higher level technicians showed up to my house after my issue was escalated, and he didn't even try to help. He came over and left 3 minutes after arriving, without calling my number or ringing the door bell. The customer service is infuriating, and my hotspot functions better than my internet most of the time. My download speed drops to 300 mbps and my upload speed drops all the way down to 0.01 mbps, where I can't even use google. I hope this can be resolved soon, as it has been occurring for many months already. What is the point of paying for such a service?