As the others have said, eBay gives you the tools to stop non-payers - just use those tools, then eBay will take action............
https://www.ebay.com.au/help/selling/getting-paid/resolving-unpaid-items-buyers?id=4137
https://www.ebay.com.au/help/selling/resolving-buyer-issues/blocking-buyer-ebay?id=4082
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"Start me up I'll never stop......"
