Your best way forward is
but that does not get you the product it gets you a refund.
There are very few products only available form a single source. How long have they been stonewalling? If it is a few days it can happen. If it is a few weeks it is inexcusable.
With a refund in hand why would you be unable to afford it? Was it a special promotional sale? Has the price gone up? (no need to answer unless you wish to, just trying to clarify your situation). If you got that item refunded would you be game to re-order it from Samsung online if it was at the same price, knowing what you know now about their business practices?
If you have provided them with a copy of the freight delivery receipt showing they have received it and they still will not budge and it has been more than a few days consider if you really want to do business with Samsung online.
Product dependent you may also be interested in this related topic
as well as other numerous other topics focusing on Samsung lack of post sales interest in their customers.
If you want to persevere it could continue your frustration, but read about your rights under Australian Consumer Law (many links in many topics on the Community, or use an internet search) and send Samsung management/complaints a formal ‘Letter of Complaint’ - there is lots of advice on the Community as well tools from Choice and the ACCC in how to write one.
