Barons VW Durban

My husband purchased a very expensive demo vehicle from the mastercar section of Barons VW Edwin swales. The day we picked up the vehicle we notice a noise when the car is put in reverse, we went back to the dealership and informed the salesman. The car was booked in and the service department said its the TPI and they are waiting VW South Africa to make a part that will fit in the car to take away the noise. its now 6months later and the dealership is refusing to take back the car which is confirmed to have a factory defect. to my knowledge according to Section 56(2) of the Act , consumer can return the vehicle to the seller within 6months. But now the dealership does not want to settle the bank the full amount. Barons Edwin Swales are totally trying to blindside us into paying / and keeping a defected car. according the the VIN information the dealership was aware the car was faulty and still sold it to us. I have email the mastercar manager ( Vijan Balkissoon) and to date have he as not even telephone or email back. Absolutely shocking customer service.