Do I have a good legal case if I found out if a promoter ripped me off?

I won a prize valued at $3500 but did not receive the entire package lowering the value of the prize to $1500 and my tax liability as well too. It was supposed to have hotel and travel accomodations, tickets, and a cash prize portion of $1200. It was also subject to availability. I got the tickets and the $1200 in cash, but when contacted about it, I was unwittingly lied to that I had to pay for the hotel and travel because the hotel and travel portion ran out of funding and due to the subject to availability I had to pay for it using the $1200. I found out later that was a lie and they received the $2300 to accomodate me fully. I did not find this out until later on after I accepted the prize.