The first suggestion Paypal will give you is Contact Seller.
This is not a command, just a suggestion, and in this case ignore it.
I suspect you were somehow lured 'off-eBay' for this purchase and the seller had no intention of shipping anything.
Paypal has a very strong Buyer Protection program and you can open an Item Not Received Dispute for 180 days from payment.
If the seller cannot prove delivery (not shipping, delivery) you will be refunded.
Come back if you have other problems or questions.