Extremely poor service

I purchased a brand new car in August 2015, on Monday 14.12.2015 I started experiencing problems with my aircon by Tuesday the 15.12.2015 the gas had completely run out. I took the car into the dealership as a walk in, after a 2 hour wait it finally was my turn, the techinician and the customer service rep both asked me to take the car away and book the car in for another time. After saying that I wanted help as with the rain I was experiencing difficulty demisting the wind screen, my car was regassed. Before leaving the dealership I expressed my dissatisfaction with my sales rep. On my drive home I received a call from the service rep saying to bring the car in on Thursday 17.12.2015 and he apologized for the problems with the car. Also I was told the car could be kept overnight and that a loan car will be arranged. To my surprise I take the car in on Thursday morning only to get told by another manger that there is no use keeping the car, let them check for a leak and I should wait for the car. After a few minutes in the workshop I was told they can not find a leak so I should take the car away and monitor it, from no leak to the gas completely emptying witin 24hrs? What now