Car service city

Dan Car service city at eloff street Johannesburg i don't think they know what are they doing, I took the car for wiring, my car was not having the problem of anything, it was just wiring, they did phone me while their busy with wiring problem and told me my car is having a problem of petrol pump, I said to them you can change the petrol pump, since they change the petrol pump and wiring my car is no longer having power, I stucked with the problem of the petrol pump in the middle of the road, I take my car to vw and they replace the pump, I bought 2 petrol pumps twice a month and I asked they refund they don't want to give me my refund. Wiring is a mess, is like they someone from the street to do the wiring for my car