Service of vehicle

I must have had the worst experience yet. I took my vehicle to be checked out after a oil leak. The day i took it in, just after about 11 am the service adviser told me that my turbo needs to be replaced and its going to cost me. R 30k. to date i have never received a report showing the faults mentioned. I went to see the dealership principle today and he just bluntly put it like this:i trust my service technician and he is the only master technician in the country. if you want the report on paper is old style, if the technician says it needs to be replaced then you need to do it no questions asked. i don't even know what you are here for. Mark said. I will never take my vehicle back there and how many other people have been done in this way, by spending so much money when it is not even the problem. i took my vehicle to reputable master service technician RMI accredited and paid R 1000 to fix the problem.