The Most horrible Car service In Africa

I took my car for a Mojor service on the 06/06/2019 at Car Service City Polokwane .Mojor service was done as I accepted quote and only asked them NOT to replace Dim and bright light .On the next day 07/06 I could NOT drive more than 50 KMs ,engine light turned on ,NOT only that , the car was also making funny noise and I immediately called them ,I was told to return the vehicle for check up .Someone was called on my arrival to check it .He brought tablets ,Checked and right in front of me he cleared the Engine light and told me is all ok I must just drive about 10 KMs with Gear number 4 to clear some stuff .This did not help ,the Engine light became on again and I took the car back and this time it took about a week there .No body called me except for me calling and getting different stories which made me even worry .I went there to complain and Branch Manager told me they have now detected that valve breather control Unit tube was damaged and it needs another R 4600 on top of R 7400.00 That I paid for major service .I went to fetch my car on the 04/07/2019 after a week THERE .It did not help because I could NOT even make 40 KMs on my way to GP.I called again and I was told not to worry just to look for another car service city in Pretoria and they can help .I could not accept this and complaint to their Head office .The Head office only asked me which Branch I went to .That is it .Any body reading please help how do I get them fix my car .