let me tell you this about paypal.. they will never take any side buyer/seller of online goods, as you can read their terms you will see what you have to do to get a refund from them.. What happend to you i think the payment was made from a fake account or stolen account in that case you will not get the money back what ever you do
Last week i require to get money from clients and advertisers, but nah, my PayPal account entrée is randomly limited as of a week ago. If they suspect any fraudulent action (not defined anywhere on the PayPal site, but if it means "sending and receiving amounts of money around $1500" then I guess I'm a vast fraud), they mechanically lock it down and you cannot take nor send money .