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What to do when you might have been ripped off on a second hand website?

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I found an iPhone 4s on a second hand website for 200 euros with everything included, guarantee etc so i sent half of the money last thursday and i sent an email to the guy asking him to tell me when he's sent the iphone so i know when to expect it, but he hasnt replied... If worst comes to worst and he doesnt reply or send the phone what should i do??
Thanks!