They cannot fix their own cars

I dropped off my car 3 weeks ago at the vereeniging branch and to this day they havent been able to diagnose the problem. At first they said it was the distributor so I paid R15000 for a new distributor only to find that that was not the problem. Then they said it was the ignition and I paid R2400 for the ignition key and that was still not the problem. So now my car is just sitting in their garage cause they are tellling me they cannot diagnose it.