Poor service

<p>I bought a car from CMH GM East Rand, soon after buying the car it started giving me problems with noisy brakes and also a knocking noise on the front right wheel suspension. I've taken the car back several times for service but it seems as if they can't diagnose the problem.I am new to the brand , and i had believe that it's a great. </p> <p>And apart from the brakes and suspension I've been experiencing some popping noise in the engine whilst idling the car,and i had previously reported loss of power in the vehicle but only to be told that it has no problem by the service adviser.</p> <p>I've only own it for +/-5 months and i am experiencing such,it's emotionally straining </p>