Poor Service received

It's hard to believe how loyal clients can be treated this poorly, I bought a new vehicle with them last year, this year I noticed my aircon not to be operating and reported it, told it needed gas, got gas and worked for a day only and couldn't work again. Took it back again and told the experts says it needs gas again, I was surprised how they determined that problem as it was gased just about a week and half ago, anyway, I took it back in , and of course the aircon didn't work for long. I took it back again, then I am told the condenser was off as the vehicle could have been involved in an accident, which startled me, and told that it will be replaced and will have to pay. After 4 days without my car, I was phoned to come collect it, then I asked for the quotations to see what happened to my car and what was fixed and owed for that matter, I was told, it's OK, just get the car. The aircon worked for about 3 days and it's not working again now, and I got a phone call to come pay for the condenser installed. I do not understand what is happening at this place, all I need is to pay for a car that has a working aircon pls, as far as I know I am also paying for the warranty on that vehicle but I am not happy at all with the service I am receiving there. We tried complaining by the manager, nothing is improving. I don't know what to do now!