Dont stress about it mate. I've had correspondance with them since sunday, so they're still operational =P
They dont seem to be in the office every day so you'd be lucky to get them on the phone. Send them an email and I'm sure they'll sort you out as soon as possible.
If you only ordered on sunday I really wouldnt be stressing yet.
Give it a week and if there's still no joy THEN you might have an issue.
ps. 2 day delivery times are rarely that. Combine human error, non-business days, payment processing delays and the "wonders" of australia post then you'd have to be very lucky to actually recive anything within that timeframe.
edit:
Just read timestamps lol, bit late to the show. Did you end up reciving your package?