The eBay Resolution Centre is at the bottom of this page.
It is fully automated and fairly swift.
The first suggestion is to contact the seller. If you have already done that, escalate immediately to a Claim.
If you haven't, don't get hung up with the seller.
Ask him for date of shipping, service used and tracking number.
Unless you get either that information (and the tracking number is working) or an immediate refund, go to the Claim.
The Paypal Resolution Centre is at the top of your account page under Tools.
The system is the same.
If you used your credit card directly, phone the 1-800 number on the back of the card and ask about a Chargeback.
