User Activity

Buyer opened an INR case for an item I sold (thanks Aus Post). I cannot send a message to the buyer. When I click Send Message it goes to a page saying Access DeniedYou don't have permission to access "http://www.ebay.com.au/res/ItemNotReceived/SendM...
Buyer opened a INR case on ebay, ebay ruled in my favour. Can the buyer still go to PayPal and open another dispute there? I mean, on the buyer's PayPal it would be shown as paid to eBay rather than me, the seller.