Pathetic Service

I purchased a Hyundai i20 at Constantia Kloof in May 2015. I was promised that 2 chis on the body will be 'coloured in' with a white pen - I have followed up telephonically numerous times and when I leave messages, I don't get a call in response. I did get hold of Darren 3 times who kept on apologising that the white pen is in demand and thus none at their premises at the moment. I am still waiting for a call to let me know that I can come in for him to fix what we promised.<br> AS this was winter, I didn't use the aircon, but low and behold, when I started needing it, I realised it needs to be re-gassed(how do you purchase a car with 30200 km on it and no gas? Is it a leak? Either way, how do you SELL A CAR WITH AN AIRCON AND THEN IT DOESN't WORK. THEN I NEED A REFUND ON MY MONIES PAID AS THE AIRCON IS DEFECTIVE AND THEY WANT ME TO FOOT THE BILL FOR A SERVICE i NEVER RECEIVED. ON TOP OF THIS, THE DEALER PRINCIPAL hasn't phoned me back to explain or apologise or amend this situation. I am a very unhappy customer and will not pay an extra R900 for an aircon that is defective, as purchased. I request a response and solution to this problem from Hyundai.