OP,
Here is a link on PayPal's site that will help you understand how they handle fraud:
https://www.paypal.com/us/webapps/helpcenter/helphub/topic/?topicID=FRAUD&parentID=PROBLEMS&m=BT
It looks like they are having a technical issue right now as it does not load the answer I clicked. However, here is a link to give them a call
https://www.paypal.com/us/cgi-bin/webscr?cmd=_contact-phone
They will be able to help you resolve the issue and hopefully advise you to the best course of action. I'd make sure you have all of the facts before calling so that you don't have to estimate or guess. Since you did not gift it, I would imagine that you'll be covered by some type of protection. Only PayPal really knows. Give them a call and let us know how it turns out.
It's worth noting that I back up what some others have said... sometimes online transactions get delayed. People's lives and responsibilities get the best of them sometimes. Just my 2 cents. Best of luck to you!