Someone purchased an ticket from me on eBay that I can't resell but didn't make payment. eBays policy states they are legally obligated to pay and I've made several attempts to contact them, but they haven't responded at all, even after I opened an unpaid case on eBay. This is for a $455 item and I would like advice as to roughly how much it would cost me to sue. Do I have an eligible case, and if that option is too expensive (as I have a feeling it might be) under Australian Consumer Law? Is there any official warning/letter I can send them about my intent to take legal action if no payment is made within said amount of days? Thank you, any help is greatly appreciated.