Maybe the seller never sent the item, or maybe it got lost in the post. Whatever happened, you paid for the item. If it doesn’t arrive in the post as described, you have the right to a replacement or a refund, whether it’s the seller’s fault or not.

The fact that you bought something on eBay doesn’t mean that you don’t have the exact same rights that you would have if you bought it in a shop (these rights are pretty much the same all over the world). Plus, under eBay’s rules, the seller isn’t allowed to change their mind about selling you the item: once the auction ends, it becomes a contract – you must buy and they must sell, or face eBay’s penalties.