Fake/Scam payment request using paypal

I have no idea whats going on.

One guy signed up on my webhosting and made a purchase of 2.50 $ for one month of shared hosting. Paid using paypal.

After a few hours he sent me a paypal payment request for 300$. Now this request shows in my paypal account as pending.

I never bought anything from this guy. I don't even know him and he sent me a payment request for 300 $. What am I supposed to do now?

http://ift.tt/1dvHQ0Z