Stallion Intellectual — Please help me in this issue.

In the year 2017 i have got a call from Stallion company for work, due to some issue i could not start my work, next month i got call from the stallion intellectual company that i have not complete my work and company will take action on this and told me that they will file case under multiple section like 17, 420, 499, 509, 66 A, section 15 of IPC and 37, 73, 74, 75. As per indian contract act 1872. I have paid the amount which they have asked me to pay and also they issued me NOC copy, But today i got call again they are asking me to pay money. And to clear 1 section they asking me 21, 500 RS tp pay. They have issued me notice and telling me to pay the amount. If i failed to pay the amount. i should pay 10 to 15 lakhs to there company and they said i should go to jail. i belongs to lower middle class family and i could not pay amount. please find the attachment. I request you to kindly resolve the issue and provide me justice in this.