Call back!!! You never know if it's them...they may be wanting to see if you take the initiative to call. I like to cover all my bases :P
And definitely get your first aid before applying again...I remember at the Qantas interview, saying that they were only going to take people who had all the necessary documents and the people without them would have to wait.
I think that's the reason i didn't a position with Qantas - I aced the interviews, all my refs were contacted but i didn't have my first aid or RSA to get me further along in the process.