Audi is the worse brand

About 2 years ago my Audi S5 was given to Audi east rand in which the car was more in repairs than used by me and now it's gone missing for 2 years it was at Audi East Rand now it's gone. I have contacted audi and no one has got back to me if this matter is not sorted I will be opening a case of *****t of motor vehicle as well as David Ried who was the person in charge