Help needed

So our car went in for a simple service oil etc… a day later our car is having issues that we never had before like not able to start couldn’t go into gear and the list goes on … we had to return the car to them and they have it ever since saying that firstly that it was a loose wire and then it was not but something else etc always an excuse … the customer service is pathetic as I always have to call or my wife to find out the status of car … we constantly needed to request the quote for fixing but they always delay and don’t provide… we just received a call to say that it would be R70k to have it fixed and now i am lost as they still have my car