Engine overhaul

HiQ Groblersdal, I have never received such a poor service in my life until I took my car to them for an engine major service/ overhaul. They charged me arm and leg, yet performed poor mechanical repairs on my car, now my problem is that when I took the car back to them to rectify their errors(return job) they kept it long in their shop not attending to it, and when they did...they quoted me to pay another extra costs,how possible is that, now still after those costs the car is parked coz of major oil leak. That was between (June-August)WOULDN'T RECOMMEND THIS WORKSHOP TO ANYONE.