Am having a paypal problem not sure if its fraud?

am selling a camera on gumtree. the buyer asked to send the money via paypal. first paypal asked for the shipping receipt then they can credit the money to my account. then they sent me email saying their department has made an error with my payment, which they send £300 more than the total amount. so they asked me... show more am selling a camera on gumtree. the buyer asked to send the money via paypal. first paypal asked for the shipping receipt then they can credit the money to my account. then they sent me email saying their department has made an error with my payment, which they send £300 more than the total amount. so they asked me to send £300 via western union within 48 hrs refund the balance to the buyer so they won't stop the transfer of the payment in transit into my PayPal account. its truly a nightmare n i dont know if i should tranfer the £300. can someone familiar with these system tell me if i can trust this. many thanx
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