Audi middelburg poor customer service

Well to start with, i responded to a add of a 2015 audi a4 with 95K on the clock. After all paperwork was handled and me trying to get insurance on my new car i found out that the car is a 2014 model with 104500K on the clock but priced as a 2015 mode for R300Kl!!! I phoned my broker and she said that they are trying to do me in on the deal and that they should refinance the car for the correct price so i spoke to three employees of Audi Middelburg (managers included) and still no answers too my questions. I also pointed out all the damage on the car and i was told it will be fixed. I was also told that the car had a full service prior to being sold. A week later i sent the car back to get all problems solved. I waited two days for the car and all they did was change the wiper blades and service the car after i was told it was serviced!! I'm still waiting for the licensing to be completed and the rest of the problems to be resolved and its been a month later!!! I told them I'm going to cancel the deal but they say it doesn't work like that! What should i do and how can i cancel the deal!????