If Ebay refunded, rather than you refunding voluntarily, you can appeal their decision.
Make sure you have the tracking showing delivery to a different address to use as your evidence.
Put 'appeal a decision' into 'help & contact' top left of your Ebay page.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)