Datalink Infotype — illegal company fraud business...

I got this job details from a website called clickindia. The plann was 2200 forms in 20 days and payment is 55000. Later i agreed and through digidocs sent my photo and signature after few days i came to know that it is a fake company and i stopped my work and the informed the same to the company through a mail. Now again two days back they sent me a mail from legal department asking me to pay 7600 rupees and harassing me and threatening to take legal action against me. I should pay it immediately or else they will double the fine amount. Please help me as soon as possible..