Renault problems with car and service

i Bought a Renault Clio 4 brand new out of the box in June 2013 on 20 000 km my air-con broke and my dash started peeling for no reason and they said its my fault and will not be replace. i took the air-con it in to be repaired then my car started leaking oil and jerking or shuddering i took it in once again and they could not find the fault, 2 weeks after that my Clio didn't't recognise my key card so i was stuck couldn't start the car. then Renault had a call back on the brakes and wheels and i mentioned every time that my car is shuddering my car at this stage all still under warranty maintenance and service plan. i took it in for 60 000 service and they told me my car is shuddering which i mentioned time and time again they told me i need to put R4000 down just to open it and once it was open they told me its my fault the clutch is shuddering even tho i mentioned this already on 30 000 and i now need to pay a further R5150 to fix the problem. I'm very disappointed in Renault and will never buy or recommend Renault to any of my friends the after sales service is non existent