Sharp Innovations LLC David Peterson Took money for documentary stamp tax for sale of timeshare Kissimmee Florida

I got a call from a man named David Peterson who said he was a lawyer from Sharp Innovations LLC .  He knew I had paid $500 to thar company in 2011 to sell my timeshare within 180 days or my money would be refunded.  I had asked for a refund, bit they said I was three dys too late for it, but would keep me on file and keep trying to sell it.  So out of the blue on Sept 9,2014 I received a call from above mentioned David Peterson saying he had buyers for my timeshare for $12,500.  All he needed from me was to pay the documentary stamp tax.  I told him I didn't know how to pay it.  He said he would get the buyers to pay it.  Afrer a few minutes he called back saying they gave him their debit card to pay it, but I needed to wire them the money back.  It was 689.32 and I needed to wire it immediately or they might back out.  I did this.  He warned me not to tell anyone at Western Union what this was for or they might think it was a real estate transaction and we were trying to avoid paying taxes.  on 9/11/2014 I received a call from Mr. Peterson verifying my address so he get get the contract on the mail today.  This evening I received a call from Western Union that my transaction didn't go through because the buyer, Joel Leonard Toribio, said something about it being a real estate deal.  He said Western Union would send me a money order for the amount I sent.  I immediately called Mr Peterson and he seemed flustered.  Said he would call Mr Toribio and see what happened.  (This is 2 days later). He called back in 5 minutes to confirm what Western Union told me.  He said Mr Toribio opened his big mouth about what the money was for.  So here's what he wanted me to do since he already had their money in escrow we needed to move quickly before they back out.  He asked me to go to a different Western Union and send the money again.  Then Saturday the money from the sale would be in my hands.  I asked him why he had Mr. Toribio paid my documentary stamp when I could have sent him the money myself and wouldn't have had to do all that.  He didn't give me an intelligent answer.  He said he would call me tomorrow at 10 a.m. My time to get the transfer number.  After I hung up I called Western Union to see if they really called me from Miami, Florida and after explaining what happened, they traced the transfer, and Mr. Toribio received the money on 9/9/2014 .  They assured me it was received.  I only used my credit card to Sharp Innovations in 2011 to pay the $500.  With Western Union, I had to pay cash.So now I am wanting revenge and my money back. I hope someone has some advice on how to get them taken out of their scamming deals.