Something similar happened to me a month ago. In this case the courier (DHL) contacted me, told me what happened, asked me to supply documentation confirming the purchase price (the seller had "helpfully" under-declared the value of the item) and after I supplied this put me in contact with the correct person. If Aust Post can't do that I suggest the customs help desk. Expect a long call, or series of calls, and stay calm.
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