I suggest joining the Australian Masters of the Universe Collectors Club group on Facebook. You should be able to contact admin who may allow you to put up a public post asking for the site owner to contact you directly.
Trouble is, the dude is small time and is terrible at checking emails/messages. I've seen people post that he has delivered their Snake Mountains, but given how small time he is, he's likely just slowly working through a multitude of orders (not just for SM but for other things). You may get lucky and he gets yours sorted but I'd personally try and get in contact with him, and the Facebook route seems to be the best bet.
Good luck mate!