Horrific 2Months Wait from BMW

About two months ago whilst driving my car lost power and would only move at a max of 30km per hour. I got it towed to BMW Club Motors Fountains. They first told me that my injectors were all faulty and gave me a quote for R48, 000. I responded that's impossible as I had reconditioned my injectors which cost me around R10,000. They were not able to find the fault and were persistent that I had to change my injectors. I then directed then to look at a specific injector, it's like I was doing their job for them. They then changed that one injector was now faulty and I got that one reconditioned AGAIN at my own expense, the problem persisted. I kept getting promises that completion will take 2 weeks, this turned into 4 weeks, and now 2 months. They then later made me change a injector connector after about a month. I ended up buying another car due to the inconvenience this caused to my job and household. I would not expect such from a supposed SUPERIOR BRAND. I have lost faith and my 3rd car will most likely be a Mercedes as I doubt they struggle to diagnose their own product after 2 months. I will notify my networks on twitter, FB, Yelp, RipOffReport and MeasuredUp.