My Car broke down an hour after being collected

My name is Andre Baartman. My car went to seamans Renault in George on Wednesday 10 June for a quotation for electronic work. The car then was worked on, by Renault. They did a diagnostic test which I had to pay them R700 in cash. The new starter was put into the car on Friday 12/06/15 of which my policy paid for an amount of R5304.93. Renault phoned my exactly at 14:22 p.m to collect my car. I drove the car from renault to my house and parked it. After half an hour at15:40 I started the car and the car wouldnt start. The car was dead,no power on it. I then phoned Renault to nform them about the problem.Then the owner/manager of Renault George Branch a Mr Steven Kenny and a macanic came to my house to check on the car. They opened wires infront at the fusebox. Then he said sorry,we didn't work on your electronics? I MEAN A STARTER IS ELECTRONIC WORK! Why didn't they tell my listen the is other problems with your wiring? why did i pay them for diacnostics? Mr kenny told his macanic/tecnition - if you want to help out your mate, you can came after hours tonight and check the car- Gave my keys and left? My car is broken.I am disgusted by the service i received from Renault George!!!!