Did you use Royal Mail? You can claim back from them . There's forms on the website and you need to print off screenshot of the sale and proof of payment. I did and got my money back .I’m having to refund someone as they’re saying the item I sent out never got delivered. I have the receipt still to prove it how ever eBay was on their side because the receipt didn’t have tracking number they kept saying talk it out with the buyer how ever buyer was ignoring my messages after they sent the one saying they’ve not received it. Never selling on there again 🥲