Akt Enterprise — akt enterprise - fraud blackmail

This month i took a job from akt enterprise. The job is about typing captchas. They insisted that i have to type 7000 captchas in 7days with 90percent accuracy or else i have to pay them 5100rs. I also got a contract telling the same. I have send picture of myself and a picture of my signature (I did not manually sign any contract). They assured me that the work will be very easy. The job was impossible to complete because there was many technical errors with the app which prevent anyone from completing the job like we could not tell the difference between i, l and | (Slash), and many other errors like unable to login etc. They also provided a complain department phone number but when i call them they are either busy or switched off. We don't know anything about this problem. Obviously i could not complete the job and now they blackmailed me. Unfortunately i have already paid 5100 rs as written in fake contract and after that they said some case is. I have been such a fool to pay them 5100rs. They are constantly blackmailed me and i paid so much amount also. I searched online about these jobs and akt enterprise and found out that this company is fraud as i saw a complaint against this company. Please help me to retrieve my money. I am mentally exhausted from their blackmailing.