Audi S4 still not running properly after paying over 50K

I took my Audi S4 to Megatronics SA over 4 months ago for a gearbox repair after weeks of frustration nagging and shouting we got the Audi back they where paid over 50K for the repairs and the Audi is still not running smoothly we where told that the car is in adaptive driving process but the car jerks as far as you drive slips gears and after pulling it into the garrage now doesn't even go into reverse what does that have to do with adaptive driving and then continously gives an error of gearbox malfunction my car is not repaired we where just ****** of over 50K and then my car went in with the original battery now I have to drive with a smaller battery supp**** by Megatronics SA untill they can find my battery or replace it and my car came back with 3 dents on my boot that was never their before and scratches on my bonnet I'm so upset we keep on asking to speak to management and get refused but when they received our last payment they where quick to tell us that they first need to speak to management as we cannot have the vehicle unless payment reflects in their account so I want answers from management and not Chris who claims his management because he isn't as he was the one who told us that he must first take it up with management they are just robbing people of their money