Power Steering Failed problems of the 2013 Audi S4

The power steering in my new 2013 Audi S4 failed while driving 4 days after purchase. I couldn't turn the wheel and needed lot of effort to turn it. I luckily managed to get back home. The power steering malfunction showed up on console when I was going at 35mph and I panicked but managed to control the car. I couldn't even park the car. As I took the car from a dealer who is 40miles away from my place I had to call them but they mentioned that they cant tow the car 40miles and gave a nearby service address. When I called the nearby service they said that they dont have any loaners and cant help. My purchase dealer finally sent a tow truck and I had to go along with them at 9 pm to the service center and even they mentioned that they don’t have loaners available. Luckily a lady then just dropped her loaner car which was given to me. The service center mentioned that the power steering module failed and needs to be replaced. I was shocked to see steering failure on a 4 days old Audi I clearly mentioned the dealer that I wont be taking the old car and asked for a new one. Its been more than a week and the Audi response was soo sick they cant find a similar car for me. If the color matches then the options I preferred wouldn't or if they match the color wouldn't. I am soo frustrated that even the so called premium brand cant even satisfy their customer with what they want? they decided what car I should be taking by giving me very few options which doesn’t satisfy what I want even after spending a lot. The steering failure is such a life hazard and would have caused an accident. Some serious action needs to be taken on this but dont know whom to contact. I dont know if there are any region wise head for Audi with whom I definitely want to talk but the advocate says that they cant help. This is the most scared and frustrated experience of owning a premium brand like Audi.