Paid for a job not welldone

Hi<br> We took our car for fixing at GTI Master in Alberton, After fixing the car would not start 2 days later and we are unable to get the mechanic to fix it or rather he promises and don't deliver, today its day 2. We had paid in full and now we either ask for a refund or that he fix the car thoroughly this time<br> <br> His Personal number ***