already set up on eBay? In which case, eBay will automatically start the process if no payment is made within a set time period (they will send you an email advising you of an open case). If you did not select this option with eBay, then, yes, open a non-paying buyer complaint. Think it takes about a week, if and when your buyer fails to pay, eBay will let you know their fees have been refunded and you may contact another bidder or re-list the item. I would suggest blocking this particular bidder from participating in your future auctions.