Merc Constantia kloop GP(Terrible service)

Worse service by Constatia kloof,14th avenue JHB,took my car for checks for misfire and i requested to spark plugs changed and my invoice was split into two which resulted with me paying more on VAT,three days later the car had the same problem and the rude workshop managet told me that the initial issue was injector no 1 amd now injector numbet 3 is the problem amd i have to pay again.I feel like this branch doest know their cars,they did not have answers for me amd the manager kept saying"i know you want to use my words against me"i took my car to another workshop who advised me that when changing injectors,yku change all of them not one or else the problem will not go away,something the manufature failed to tell me.I will never go there again and i lodged a compmain with Miosa