Trouble since day 1

I do not know where to even begin. Since day 1 of purchasing my car brand new from Audi, I have had endless problems. I have taken it to Audi Pietermaritzburg, Audi Claremont and Audi Waterfront. Once they sell the car they no longer care! When I purchased the car (I did not see the car as I purchased it from Audi Claremont and it was at the factory and would be delivered to me in Pietermaritzburg) I was told it had rear sensors (It did NOT!). I had to then pay for them to be put in myself. My Stop Start has NEVER worked ( been in 6 times and still does not work). My windscreen wipers would go full blast for a droplet of water but then when it rains, they do not turn on automatically. My radio was an issue (they fixed this - surprise, surprise). Now my most recent problem is the windows. I have sent it to Audi Waterfront twice. Both times I get my car back and they say it is working. IT IS NOT WORKING!!!!!!!!! I now have to get out of my car and walk around ever single day to use my fingerprint to get in and out of my estate. I have sent them a video of how my windows do not work and I never heard back (it is 2 months later). Every time I call, the person I ask for is busy. I get told they will call me back. They NEVER do! I highly recommend that if you are considering purchasing an Audi - my advise would be to think twice.