BMW Port Elizabeth ****med me when repairing my car

My BMW 1 series was faulty, it did not want to hold idle and also it was taking itself out of gear, it will go straight to manual, so I took it to BMW port elizabeth to get it fixed, I was quoted R55000, after they did diagnostics on the car. Diagnostics money is also included in that R55000, they did what the did in the car, when I went to fetch the car I was told I need a new battery. The battery I had in my car was still new , I bought it in end of February, they told me I need to get a new battery because the one I have is faulty, so they kicked started the car for me to drive to the place I bought the battery from. When I got there they gave me a new battery.when I start the car all the faults I have on the car were still there, I mean all the faults and alarms, I called them to tell them that the car has all the faults and alarms, they told me I can bring the car to do further investigation but I will need pay again to check the problem. I really feel ****med by BMW Port Elizabeth. I paid them for nothing because all the problems are there in my car , even their customer service is useless.