Unhappy MKR auto customer.

Goodday I would like to know why is nothing happening to MKR auto sales for selling faulty vehicles to customers, I bought a 2015 Opel Adam from Rostill. His friendly but so are all salesman to get the deal done. My Opel Adam touch screen did not work, I was told in the conference room, just a system update. I took it to Kelston Opel which informed me the unit is faulty , I went back and told them. After numerous Whatsapp, I considered legal action that will cost more. I was send a document by Rostill to sign, after I told him there are certain points that are lies. So far I paid R9800 out of my pocket extra, and unit still not fixed. MKR auto sales need to be investigated or closed down. Daylight ******* with their false smiles. Never buy from this dealership, most if not all cars have faults. Just wish people can see this. Once the car is sold and deal is done they not willing to help at all. They need to be exposed.