Hey Integro,
Sorry to hear about it. I had a similar situation in the CPL AGK exam. I found that in all honesty if I had my time over I just would have accepted CASA's bullsh1t answer and try again.
Believe it or not, I actually had two different officers in the Flight Crew Licensing division fighting with one another as to the wording and correct answers. Now if they can't agree amongst themsleves, what hope do they have of agreeing with you...
What I did was get exceedingly blind drunk after the exam and started over. I got it the second time around, and the ambiguous questions were still there, I just knew which answers they wanted to hear.
IMHO, the majority of the CASA exams lack any kind of industry relevance and are simply a hoop jumping exercise.
Good Luck with the re-sit Integro,
j3