Frontech — part time job fraud

I was offered a job of filling 1500 forms @20rs per form. I had completed my work on time but they generated a qc report which was all manipulated and wrong. I called their helpline no. But they asked me to contact their advocate. He threatened me to pay 4500 + 3000 rs otherwise i would receive a legal notice. They had made a fake agreement and put my name as a signature on it and are blackmailing me for violation of agreement. Now they have again sent me an email with the same threats. I want you guys to take strict action against them