If the seller is not responding to messages, there is really only a couple of options. Hopefully, you paid via PayPal, Paymate or credit card? If so, I suggest opening a dispute for the transaction. That won't necessarily get the seller to post the item to you, but if they don't (or haven't), you should receive a refund if you follow through the dispute / claim process (if you need any help with that, I'm sure the members here will be able to assist - to contact eBay directly, as it is just other members like yourself in the forums, you need to click on Customer Support, then Contact eBay, then select a topic to reveal the contact options).
