i got tricked into buying an iphone 5 with icloud lock the person will not respond what can i do

If you bought the iPhone through a place such as Amazon or eBay, ask the people who run it for a refund. Otherwise, nothing.

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The information above applies.

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Then you're out of luck. There is no way to make the phone usable without the previous owner's cooperation. You can go to the police, as it's probably a stolen phone, but that's about it.