Paying for a service not received- Unhappy and disappointed

I am high disappoint with the service received at Bosch Randburg close to the old Brigh****er commons. I took my car in to get a diagnostics and they came back saying they had found the fault, when I collected the car 2km away from Bosch I got the same error message, I informed Jaco who was assisting me he asked me to take the car back, I took it back now he came back with another story, informing me that that it will now cost me R72k, he then offered me 10% discount on this amount because I paid for a service which was essentially not provide to be. I then went for a 2nd opinion and it turned out it is not what Bosch said it was. I told Jaco I wanted my money back that I paid the I got the same error message as I drove out of Bosch, he said he will speak to his manager and to this day I am still waiting, I will not leave it at this. They like ripping of women because we are vulnerable and desperate as this is a necessity to us. I want my money back and I want people to know of they service they provide