Should i contact my lawyers or the authorities for a scam?

Yesterday i bought an iPhone 5 from a guy on craigslist for $550, the phone ad said it was an unlocked phone so purchased it. I went to t mobile and payed my first month, they asked me if i was positive that the phone was unlocked because its non refundable, i said yes thinking it was unlocked and payed the 70 dollars, they told me the last step to do was to restore the factory settings on itunes. When i tried an error message came up so i took it to apple and they said it was still on the sprint network and it wasn't unlocked. I called they guy back wanting a refund because he said if i had any problems that he would give me my money back. When i call him he says that he was busy and was gonna call me back later, i asked him today? He said yes, he never did.i've tried calling him about 10 times and he still dosent answer.i've had enough of this. I have his licence plate and name and number should i contact the authorities fist or call in my lawyers?

Authorities

Lawyer or just sue in small claims court. This is a civil claim, he hasn't done anything criminal. Buyer beware when you're paying a low price for something that shouldn't be.

LOL, if you can "call in my lawyers" wth are you doing buying into what is clearly a scam? Caveat emptor.

If something is too good to be true, it probably is…

Contact the police, you bought stolen property. Get the police report. Then sue the seller in small claims court, if you can find him, that is.