If you did pay and the seller did ship DO NOT REFUSE THE PACKAGE!
EBay would then consider the package Undeliverable, and would not require the seller to refund anything.
Instead, open a Not As Described claim under the MONEY BACK GUARANTEE.
The seller will be required to send you return shipping,
When the package is back with them, you will be refunded.
You are also covered by Paypal if you used it, but you would be paying return shipping.
YOu are also covered by your credit card, but every card has a different policy.