Voorspoed motors - Dealership fails to repair vehi

I bought a Corsa 1.6 opc from a dealership ( Voorspoed motors (Buks pieterse motors bk) in pretoria on the 15/05/15 . Being told the car is 100% and that they will play \papa"in their direct words if anything goes wrong with vehicle for 6 months as per consumer law. ( car is financed by absa ) ( Exactly why i rather bought vehicle from a dealership and paid R35 000 more than private. I had the vehicle for 3days when engine light came on "