Use the link below and cancel the transaction using "buyer didn't pay" excuse.
https://www.ebay.com.au/help/selling/getting-paid/resolving-unpaid-items-buyers?id=4137
https://www.ebay.com.au/help/policies/payment-policies/unpaid-item-policy?id=4271
Edit, if it's the item sold in July, you are probably out of time to do that.
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