I suggest that if problems like these are substantiated then a direct approach to the full membership of the Senate Estimates committee would be appropriate.
Assuming that will be your last medical prior to retirement, excellent idea, for the rest of us, no. I suspect that in order to "substantiate" the claim, the pilot's details would need to be passed by the committee to CASA for validation and their own internal investigation.
Can you image the subsequent medical certificate delays that the poor complainant would suffer for the rest of his working days? Effectively CASA can railroad anyone out of the industry with constant and unceasing additional medical test demands on anyone who puts their case to such a committee. The East Germans even had word for it:
Zersetzung.
I believe the ATO are great at playing the perpetual tax audit game for troublemakers. Why would CASA be any different? Who is going to protect someone from the arbitrary & capricious faceless Dr CASA?