The correct way to have dealt with this is that if you want to return something you "open a case" with eBay within 30 days.  After that it is too late. 

The seller sends you a label and you send the item back [beautifully packed of course] 

The seller refunds.  If no label arrives you "escalate" the case and eBay gets involved.  

You seem to have done some "do-it-yourself" method outside eBay's rules. 

If - after following the advice of @**peaseblossom** - you do not get a refund you may be able to contact your payment provider. 

@mcp_max_vjmwsz