If you paid for it with a credit card through Paypal, you can ask the credit card company to do a chargeback, but it may be too late for that.
You have NO chance getting a case opened by Paypal or ebay, though, it's been way too long - UNLESS - you have messages from the seller that encourage you to wait. Sometimes ebay will let a case open late for that reason, although 7 months is stretching a point.
Imagination will often carry us to worlds that never were. But without it we go nowhere. Carl Sagan