A rip-off

I took my I10 Hyundai in for a water leak they did a pressure test, the day after they let me know that they have to remove the engine or part of the engine to do a diagnostic to see what is wrong for a amount of R 4000+ and as per there experience it can cost any thing between R16,000 and a ridiculous amount to do the repairs. I took the car to a automotive repairs in Montaque Gardens they did a pressure test, they discovered a burst rubber pipe and a small part on the engine which was defective and repaired it for R 4000.