Poor customer service

I bought a car last year May 2020 and a month later it started giving me problems and I took it for a service and within the very same year towards December it gave me another problem. I took it there again and I was told that there is nothing wrong with that car and now I have discovered that there are 2 parts that are marked with X and the very same parts are the one's that are problematic as one is burned and one is leaking oil. To start with why are those 2 parts marked? Last week I took a car for diagnostic check here at Mpumalanga I was told that the reason why cargo motors marked those parts simply because they knew that they were worn out and due for replacement. I need answers and very fast cost I'm paying lots of money on that car on monthly basis and yet it is giving me problems.