My internet wont work and the tech wont do anything and makes excuses.

I have had 3 or 4 techs come out and say that nothing was wrong meanwhile my internet is dropping business calls left and right. i go to decompress and game at the end of the night. LAGGGGGGGGGGGGG spikes every 20 secs which makes anything unless. who can i contact to get this fixed and not get excuses? just to be clear I'm a tech guy, my pc has been on fiber internet and had no problems and now I'm with you guys, I'm ready to hand the equipment after this.