Global Star Solutions — data entry work

Sir, i signed the agreement as their policy to start part time work of data entry. But i came to know that they are frauds, so i stopped my work. They sent me many mails and msgs saying they have filed a case against me. But i didn't respond. I took their calls and said that you guys are fraud. They threatened me on the phone also. But now after 3-4 months they called me again that i am a public prosecutor and want to close your case in civil court delhi. Provide me some evidence against that company being fraud. Otherwise pay the penalty. If you don't pay or close the case then they will send summoned letter to my nearby police station and i will have to come to the court.. Sir please help me out. I am a poor student.