It doesn't look like any knows for sure, and I don't either, so the best I can do is try to interpret what I know of consumer rights etc for these specific circumstances (meaning these are more related to bricks & mortar retail, so I may get it wrong, and your best bet is to contact someone more authorative, like the ACCC).
An Australian retailer is obliged to help and is not supposed to direct a consumer somewhere like the manufacturer instead (i.e. if you buy a Sony product from Target and take it back to Target, they are not allowed to tell you that you have to take it to Sony directly - you can choose to, but you don't have to). Which would suggest that when it comes to online purchases, you would have a similar right to deal directly with (and return the product to) the retailer.
