Never use bosch service centre

My car had leaking problem from a diesel pump, as results the car had no power. on the 28 July 2015 I took Diesel pump to Bosch service in Alberton (Park Motors & Diesel) I was told not to worry is a common problem they will fix it. I called the on the 30 July 2015 to check if it is fixed I was told pick it up it is ready the I paid R2827.20 cash. On the 31 July 2015 I put the diesel pump in the car it had the same problem, I went back to Bosch and the lady at the reception said the boss is not in, he will call me when he comes back, The Boss called and said its impossible my car had a timing problem, I went to the 2 x mechanics for second opinions. They all confirmed the problem is with the diesel pump, because it was on wash by Bosch service in Alberton (Park Motors & Diesel) that doe not me is fixed. Bosch please give me back my hard earn money