Bad Bad service

My Son bought a VW Minibus in January from salesman named Khutso, we were given a broken spare key and due to excitement we did not notice at the time but later realised the key has no part that you click open to start the car, we have been trying to resolve this issue for months now he kept saying he is waiting for a response from his manager but now he is avoiding our calls , we trusted this dealership but also after 2 months the car had an ignition issue which we ended up fixing ourselves , when the machanic opened it the part was market for repairs showing that they knew about the problem but chose to take advantage of a customer,now we must still need the money which we do not have to get another spare key, I would not recommend anyone to use them, my other son is looking to buy another car for himself we have learned our lesson not to trust this dealership