Poor customer service by Mercedes Pinetown

My name is Nomusa from Amanzimtoti, Durban. In December 2022 I purchased a Mercedes GLB from the Mercedes dealership in Pinetown, Durban. A couple of days after I received delivery of the car on the 29th of December 2022, I noticed the oil engine light appear on the dashboard screen. I phoned Mercedes Pinetown to report the problem and they sent a technician out to try and fix it. After spending time working on the vehicle the error still wasn't cleared. I phoned the dealership again and when the technician came out the second time, he suggested that I send the car back to the dealership to get a full inspection. On the 19th of January 2023, I requested a courtesy car, and I was asked to produce a credit card that has a credit amount of R10 000. I think it is extremely unfair to expect me to have this amount of money after I have paid so much to purchase the car. This was supposed to be a brand-new vehicle it shouldn't be stuck waiting for spares at the repair workshop.