Story of my life

I bought a golf 5 GTI from these guys day of collection it broke down then they loaned me a car used the car with no license disc till it got impounded only then my car was delivered to me and it still had problems when i called them they gave me empty promises i then had to drive down to Durban from JHB with my own money because these guys were avoiding my calls when i got there i told them that i'm leaving the car with them ,the owner told them to fix my car so they ended up taking parts from a similar car from mine in order to replace all the faulty parts from my car now my car has a issue with the Turbo I've called my sales person several times but he wont pick up my calls so i'm not clear which steps to take now car has two year warranty with them so they say please can you assist me. I've had to replace parts with my own money before .