Denial of a courtesy car and the car repaired after 3 weeks

I took my car (Audi A3) for service on 20/03/2018 and the car was fine. On the 26/03/2018 my car broke down and it was towed to the Menlyn dealership. After that they did not even bother to call me and I eventually called them after 4 hours and they told me that they received the car but they will only assess it on 28/03/2018 since there are busy. Luckily they assessed it the following day and told me that whatsoever faulty electronic component needs to be ordered in Germany and it will take about 15 days. I requested a courtesy car of which they sent me forms to complete but later responded to say they didn’t get approval from head office and they also don’t have any car they can give me from their dealership and there are not forced to give me a courtesy car its only when they can. They told me I can escalate my issue and I was told the same thing just in different words. Note: I am still paying for the car and it’s still under warrant but I had to be without a car for three weeks. This was a very painful experience and wouldn’t recommend Audi South Africa to anyone thinking about buying car.