Very very bad Service and they can not seem to fix my aircon.

I purchased a new car,so that I do not have to struggle with a problem car!!And guess what,I have been struggling with my Duster!!!!At about 35 000 km on the clock,the aircon went off. A few days later it went back on by itself!!!So we left it. At around 60 000 then it stopped working completely. At 75 000 km,I serviced the car and requested for the aircon to be fixed. Surprisingly they did not have enough time to fix it then,and I DID request for it to be fixed.My husband was then dying of cancer,so I left it as I did not have the time and energy to address this ongoing depressing unsolving issue! Then on the 90 000km service they worked on it.Later that day, the aircon went off again!!!!!!It then went on again.So I took the car back and left it there for 3 days! I told them it is working,but it will stop again. So 3 days I had to struggle without a car! I then collected the car,the aircon was working and 15km from the garage it stopped working. At this moment in time the aircon and the fan is not working! Friday the 13th of October, I contacted the dealer principal, Jaco van den Berg.He promised me to phone me. I phoned him on Monday as he has not phoned me back!So I am still waiting a week later for a response!!Seems like he is always in meetings. I then phoned customer service on the 18th. No response yet!!I have a medical condition that I can not be too hot. So this problem is busy affecting my health. I also live far from the garage,and organising a lift is sometimes impossible. I can not be without a car for 3 days again. I am a pensioner and do not have the money to drive to the garage on a weekly basis. This is terrible service,and enough is enough!!!!