Audi SA, Audi N1 city and Audi Somerset West provide dismal service

I have driven vehicles brands that seemingly don't compete with Audi, but have never experienced such pathetic service from a so called premium brand.

Around 2 months ago, my sisters Audi A3 got an engine management light that I then reported to Audi SA immediately. On 8 April 2019 Audi SA arranged a towing service to fetch my vehicle. This towing service ended up scratching a mag on the vehicle. Audi SA had it "repaired" horribly. I then complained about the workmanship, where someone was sent out to do a better job. The Audi A3 needed a catalytic converter imported, that took a month to arrive. For the time that the car was with Audi N1 city, Audi SA arranged a rental vehicle that I had to pay for, though refundable. What upset me about the rental, is that Audi only rented for up to +-7 days each time. Each time the rental was renewed Hertz billed me which really strained my account (how is payment for the rental my problem?). I eventually returned the rental and payed out of my own pocket to Uber from the Airport (Hertz) to Audi N1 city (Is this service??). Upon collection of the Audi i then expressed my dissatisfaction for the service received from Audi and the horrible job done on repairing the vehicles mag. Not long after this, I got another engine light. I then refused to work with Audi N1 city, simply because i spent so much time following up on my own vehicle and getting no service. The car was towed (to my displeasure noting the first towing incident, because no arrangement could me made for me) to Audi Somerset West where they found that a O2 sensor needed to be replaced. This was replaced, and yet again, i needed to make my own arrangement to fetch the vehicle. Yesterday 8/7/2019, I got a warning message on the car to check my Coolant. My coolant level was below minimum. Help me understand how this vehicle's sensor was repaired not even a month ago but no time given to courtesy checks???

What really upset me about my experience with Audi N1 city, is that their dealer principle had the audacity to tell me that they need to keep everyone happy. I am not the only customer. My scratched Mag is not his problem, thats the towing services doing together with Audi SA. Help me understand why no accountability is taken for the brand?? Accountability is passed with no remorse or regard to give service or show interest. In addition the call costs i incurred calling Audi SA and Audi N1 city was enormous. These costs were incurred for product failure not as a result of my driving, but mechanical fault. No effort was put in to assist me, only effort put in that's convenient to the dealer not realizing the huge inconvenience of paying a big installment with no use of the car. Payments were never missed on this vehicle but Audi as a whole has no regard for making their customer feel important.

I cannot wait for the day to rid myself of this brand. The association to it is sickening.