Contact the seller and ask for their help - if no joy contact your card provider and ask them to reverse the payment (chargeback) - explain that the tracking shows delivered and that you have contacted the seller.
You may be able to get the GPS coordinates from the online tracking or a chat transcript from the carrier confirming item not delivered to your address - if the location is different to your address - you may still be able to get a refund via the ebay money back guarantee -
