Money paid service/repair not done.

On the 3/09/2015 I took the car to Ford Midrand and explained that hazard & indicators are not working and they called me after few days and said the technician has found that the fault was the switch and I was quoted for the switch and I agreed with price. Some time last week they called me in and said the vehicle has an electrical fault and I told them that vehicles had no wiring problem before and when I brought it in everything was working except for the hazards & indicators. Their technician put the new switch in and still hazards & indicators are still not working. So i guess their technician assumed that problem is the switch instead of checking to make sure. When I was given the car the the indicators still didnt work and I've already paid by EFT, because Rezante told me everything was ok. Now they telling it had electrical fault that's why the indicators are not working. I took the car to the electrician and everything is fine. I sent emails and called no one is returning to me with a straight answer. I want them to refund me as they didn't repair it.