I have a buyer who is not happy with my product and has immediately left a neatral and opened a returned case.

I accepted the offer but as stated in my listing they would have to pay for postage. Now because this is posting from the US to Australia, the buyer is not happy with paying for the return labels and has threatened to go with eBay showing them how it is not described or what ever and looks completely different from the photos shown in the listing so that I have to pay for the return label.

Should I just escalate it to eBay and will eBay tell them to pay for the return or will I have to?