Bad service

I onced opened a complain about my vw car polo tsi , it had a problem with gear box , vw kempton Park held it for 3 months , they called me to fetch the car on May 22 , I only stared using the car on May 25 and it was making lot of noise , I called them and they took the car , I was told it was a exhaust and they fixed it , I fetched on the on May 28 , and the same day it had a different noise again , I took it there and they booked it for June 3rd , now I’m being told that they ordered parts for the noise , so everytime they bring the car back it has a new problem, how am I suppose to drive a car that is always fixed , I’m paying for a car that’s always in the garage, that comes back with more problems everytime , this frustrate me .because it’s like I bought a second hand car . I even don’t feel save while driving it .