js2k2005

So i had my clutch changed. To make a long story short. I took the car back 3 times. 1st. The clutch master cylinder was replaced. The car would shake to the extreme. 2nd. The gears would get stuck and the pedal would sink down at high rpms. 3rd. the car got stuck in the freeway and the would not start.
Now the car is running but me and the guy from Krizn Industries went at it so i need to find another place to fix it.
The issue I'm having is that the pedal is really high and above 3K rpms the clutch slips. Need recommendations on a good shop that warranties there work.
Also i would like to have a mechanic that actually know his way around an S2000.
Im located in covina ca. Thank you for any input.