Healy,
Piston Twin is quite correct, CASA actually can, and do listen. At least in my case, anyway.
A couple of years ago I missed out on an exam by 1.
Looking through the topic areas that they give you on the areas I got incorrect, I thought that I had a case to answer for. I rang up and got them to remark the exam, which doesn't really do anything. All that is, is to make sure that the computer didn't miss any of the answers that you put on the sheet.
I then asked the person in the exam department if I could speak to the person who actually wrote the question that I was disputing. To my surprise they put the bloke on, and he said the answer that I thought was correct, and then he hung up.
A couple of weeks later, I got a letter changing my fail to a pass.
I think that you just have to be careful exactly what questions you ask them when you ring up (due to privacy laws and whatever other laws CASA think up of at the time)
Probably require a certain amount of luck as well!
Anyhow, good luck with it all.
K.I.S.S.