I bought an item from overseas, it cost me $2500 and I opened a dispute, to which the seller agreed afterwards that they would refund the entire amount. It took a while for the item to be sent back and the dispute closed by default. At the time, I didn't see it necessary to escalate the claim. But now the seller is refusing to refund the item even though they received it. What can I do? PayPal will not reopen the dispute even though the seller is not going to refund me the amount and its a large amount too.