Akt Enterprises — after activation I didn't get any work to complete

I am student, and i took a job from akt enterprises. The job is about typing captchas. They insisted that i have to type 7000captchas in 7days with 90% accuracy or else i have to pay them 5100rs. I also got a contract telling the same. I have send pictures of myself and a picture of my signature (I did not manually sign any contract). The job was impossible to complete because there was a technical error with aap i. E. The aap was not installed or not opened. They also provided a complain department phone number but when i call them they are either busy or switched off, most of the time mobile used to remain closed. Obviously i couldn't complete the job and now they are blackmailing me to pay rs. Or else they will file a case against me. They are constantly blackmailing me, i have also searched online about these jobs and akt enterprises and found out that this company is fraud as i saw a complaint against this company. Please help me to escape from this trap.