I'm sorry, but it really looks you have been scammed.  A high priced item ($2,500) paid by bank deposit to an eBayer with little or no feedback because their PayPal was full = SCAM

The best you can probably do is report this to the Qld Police who handle 'online fraud' from all Australian states apparently.  Someone else will come along and give you the web address.

Perhaps the best advice I can give you, and I will probably get a slap from eBay for saying this (as well as this post being removed), is always buy those high priced electrical goods from a real store where you get served over the counter.  You get all the paperwork for warranty AND if something goes wrong with the item you take it back to the store.