Unhappy Customer

I am really unhappy with the service and the treatment that I have received at the BMW Sandton dealership. I took my car for a service. I spent R20 000 for the service and repairs and a week later the car started smoking and leaking oil. I took it back to the dealership and they gave me a quotation worth the same amount as the service, saying that the car had a leak before i serviced it. I trusted the dealership to inform me of the leak before doing the service and they have failed to do so. The was given a vehicle in the disguise that it was ready but it had an oil leak, which was very negligent coming from the dealership. As BMW advises that, should your car have a leak or smoke, you tow it to the nearest dealership, however in this case the dealership let me drive off in that condition unknowingly thus putting my life in danger and passengers who travel in the vehicle. Apon expressing all my concerns regarding my safety, the customer service manager then proceeded, to tell me that "We can argue all day but i will still have to pay the repairs" Not taking accountability whatsoever, but rather just slapping a R4000 discount from the R21 000 and saying that the money i spend is not even that much money. Its been 3 weeks without my car now and its such an inconvenience to me.