Not a very good idea trying to get anything important out of any government department on a public holiday......................
Write letters to the DAS, ministers and who ever else you like, but they won't be answered if it is found that the issue could have been resolved on a normal working day. They certainly will question the urgency of the case before they respond, if it wasn't urgent in their opinion expect no response.
Good luck, and I assume you have got your issue sorted out now.