Renault kwid dynamic

i bought a brand new renault kwid at renault the glen group 1 in may and ever since ive had problems with the car and the dealer kept telling me they cant pick up anything wrong with it but they want to fix the car . i dont understand what they have been repairing on the vehicle if they cant pick up anything wrong with the vehicle. i escalated the matter to the dealer and Renault sa and i was told that they can only repair the vehicle. i no longer want the vehicle but they keep turning a blind eye . they sold me a faulty vehicle which can make me get involved in an accident .