Freelancer — Compliant on freelancer

One man called me and told that he is fromm freelancer. Our work is to convert png to word document. After ten days you will get payment for your work. I accepted for it and he sent me work through mail. After work has been completed i sent them. For that he told if you want to get your money you need to pay 4400 for company software and etc. I paid for them. Now no one is responding for my calls and messages. And also they asked to keep sign in payment agreement pdf. I did not agreed for that. Once they asked me to keep sign, i got doubt on them. Please take any action them

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Bharath. [protected]@gmail.com