bad customer service

I took my car for a diagnostic on the 28th of September in Diepkloof Soweto , on the 29th i received a quote to confirm what is it that needs to be fixed i accepted and requested them to fix it, on the 30th they called me to tell me they need to do timing on my car , where in the 1st place i was told they need to replace a water pump. I received a call on Monday to let me in on the progress where i was told they just need to wash the car it should be ready for pickup on Tuesday , Tuesday no one had phoned and it was midday , i then called to follow up and spoke to the manager explained what had transpired and he said he will look into the matter, and the feedback i got from him was that they were still fixing my car not that it just needs a wash , today the 5th of October i was called by the manager to tell me theres something else thats wrong with the vehicle and when i asked them why wasnt this picked up when they diagnosed my car he told me that through observation the mechanic though it was a water pump . While chatting to him he became aggravated with the questions i was asking because i do not understand why only now when i had asked for a diagnostic to know what exactly is wrong with my car . I am now told i need to wait for another quote since they have diagnosed it and required more work . When i asked him where i can log a complaint he said i must go to google .