Akt enterprise - Captcha typing fraud

My name is Riyat Santhosh.
Last week I took a job from akt enterprise. The job is about typing captchas.they insisted that I have to type **** captchas in *days with **percent accuracy or else i have to pay them ****rs.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 and they have more than ****customers doing this work and none of them have failed.But that was definitely not the case. 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 or if someone picks they say we don't know anything about this problem. Obviously I could not complete the job and now they are blackmailing me. Unfortunately i have already paid **** rs as written in fake contract and now they are blackmailing to pay *****rs or else they will file a case against me. I have been such a fool to pay them ****rs. They are constantly blackmailing me and I am scared now. I have also 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 escape from this trap and retrieve my money. I am mentally exhausted from their blackmailing.

Their bank details of akt enterprise is as follows:-

holder name:- akt enterprise
account number:- ***********
IFSC:- MAHB*******
bank:- bank of Maharashtra
account type:- current

blackmailing phone numbers:- +** **********, +** **********, **********