land titlement due to 11.Dec

I got email from my solicitor that our land settlement due date is 11.Dec. ~~woohoo!!!

However, things never gonna be so smooth, never. Yesterday, the settlement agency for NAB , Perpetual , still haven't received our documents, which I posted on last Wednesday afternoon. It's unbelieveable.... cannot imagine how slow the Australian Post is !
We don't have enough time to make the settlement anyway. What can I do ?...My solicitor advised to ask for a settlement extension while still to chase up the Perpetual to check the documents being received...

Now, I knew that the only thing I can do is to : W-a-i-t!