Nalley Scion of Roswell

I purchased my Certified 2013 S5 Cabriolet from Nalley Audi on Cobb Parkway and the experience was so bad and service so poor that I vowed to never return. Car had 6500 miles and broke down the day after I took delivery. Yes the very next day. Since they already had my money they were in absolutely no hurry to fix it and I never received a satisfactory answer as to why this happened. Fast forward one year and it breaks down again. Determined not to repeat the poor experience, I had Audi Roadside Assistance tow it to the dealership in Roswell. This in itself was inconvenient because I work 5 block from Nalley on Cobb PKWY. The service in Roswell was even worse. Three promises for call backs but every time I had to call them. They said the computer showed a misfire on cylinder #6 but since they could not make it happen again Audi refused to pay for any repairs. So 3 days later I get the car back with no repairs and only a $350.00 oil change. Now I can find an expert to fix the car out of my own pocket or risk is shutting down without warning on a busy Atlanta highway.