Not sure what to say really, if what you are saying is true then either the vendor fucked up your address or auspost fucked up the delivery. Why are you using your real name anyway for AU domestic? you can use any name safely in AU and fucked if I would be handing over my real details to an anonymous drug dealer on the internet. All you can do is take it through to resolution, if the tracking says delivered to a different suburb from where you live you may have some leverage but if the vendor is of very good standing you probably will not get too far.