I was cheated online!

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I was buying many domains, as I was thinking of selling it for a higher price. But in one of the place, I got a mail saying that my domain name is too good.he said that he is a middleman, wanted me to increase the price so that he gets good money, as he was to get a % share. I did that. Then he told me to get a certificate for it at a website of his interest, assuring me that domain will be sold. The name was" haveitfirst.com" But after me spending too much, he stopped mailing. I was unable to sell the domain. Any such experience?