Got it sorted!!!
Guys, no more dramas! I rang the "brains trust" at CASA and found someone that actually has a brain and can actually sort things out without resorting to passing it onto someone else. They are going to switch my application from AVID to ASIC without slogging me with extra charges that were which I deem very uneccesary.
As per the informationa above, you only need an ASIC to access certain parts of an airport. However for example say if you fly to coffs harbour for the day with an AVID card... you land, re-fuel your airplane then decidd to make a trip into town to grab something to eat: No dramas! Until you want to get back into the airport... that's when you need an ASIC card, however my instructor said you can gain access back in as long as you are with someone who has an ASIC card providing that you have an AVID card.
Hope this helps and thank you for the replies