DISHONEST CAR DEALER

I BOUGHT A MINI FROM THIS DEALER. MINI WENT BACK AFTER 2 WEEKS DUE TO A FEW ISSUES I WAS NOT HAPPY WITH. I TOLD THEM EXHAUST DIDN'T SOUND RIGHT. WHAT THEY DID WAS REMOVE THE CATALYTIC PIPE (R20 000) PART, WITHOUT MY KNOWLEDGE OR APPROVAL. THE CAR CAME BACK SOUNDING LIKE A RACING CAR. THEY SAID THEY COULD DO NOTHING ABOUT THIS. I CONTACTED THE MIOSA (MOTOR INDUSTRY OUMBADA - WHO SAID THIS DOES NOT MAKE THE CAR UNROADWORTHY THEREFORE THEY DON'T HAVE TO FIX IT. THE ONLY WAY TO FIX IT IS TO FIT (R20 000) CATALYTIC!!!!!!!!!! AS FAR AS i AM CONCERNED THIS IS THEFT. I DID NOT BUY THE MINI SOUNDING LIKE A LIKE A RACING CAR. JOURNEY ARE THE DISHONEST DEALERS AND GOT AWAY WITHOUT FIXING THE MINI. I HAVE NO CHOICE BUT TO FIX THIS MYSELF.