Broken part scam!

Took my B200 in for a service. It came back and a week or so later had an oil leak. I took it back to them and they told me the air intake pipe was cracked. And it would cost R6000 to replace. I then took it to an ex Mercedes mechanic and he told me there where no cracks but he replaced the gasket on te compressor and the leak stopped. Only costing me R350. De Wits is a bunch of cheats!