Conned. Bought a supposedly gold sticker car that turns out has mechanical issues

On the 22nd of July I bought a BMW at We Buy Cars JHB South Branch. The car had been moved from a green sticker to a gold sticker because of a broken fog light which i was told was fixed. The sales agent kept insisting I buy the warranty for the car. This sounded like a red flag nonetheless on collection I included the warranty. I collected the car and parked it at home in the garage. To my surprise and disgust when the tracker guys came to fit the tracker there was a pool of oil underneath the car. The car sold as a gold sticker car is leaking oil. I informed the sales agent and he told me the procedure is to log a concern via the website and wait for a call centre agent to call me to advise to take the car to crm as it has a warranty. Now the warranty story makes sense. But why should I be running up and down talking to call.centre agents hardly a week after buying the car and spending R200k. This is disappointing. I advised the agent I will bring back the car and he said I am not allowed to. I am disgusted and shocked as We Buy Cars should provide customer service or take back their faulty car and provide a full refund. This is going to be a lengthy legal battle that I will.pursue till the end. It's disgustingly ************ to sell faulty cars claiming they have no issues and with gold stickers.