Seina Services - Siena Services led me into a fraud

On the day of ** September, I received a call from Seina Services along with a pdf regarding some captcha-filling job. On the call a girl namely Khushi Khan gives me details of job for captcha filling and for every captcha that I fill they would pay me Rs. *. The target was to complete ***** captchas within ** days. According to the contract if I was unable to complete the **,*** captchas or if I failed to achieve **% accuracy (i.e., ***** correct captchas) then I wouldn't receive any payment and I'd have to pay Rs. **** to the company.
So my friend and I suspecting nothing signed the "Legal Agreement" that they sent and started the job.
After working for hours and filling up at least *** captchas the count showed just *** with *** correct captchas. Immediately I researched a bit and got to know that the site http://ats.bpoworks.in is completely fraud, as many complaints have been lodged against it in consumer complaints.
So both of us stopped working. I had also lodged a complaint against the company on a website for consumer complaints which was unresponsive. Today I have received a call the company asking us to pay Rs. ***** each. The legal agreement also seems to be a hoax since everybody who had participated in the job had received legal agreements bearing the same stamp number.
I am attaching a screenshot of the mail I have received today. Please look into this matter at the earliest and help me get out of this fraud system.
I am not able to pay the penalty and now these people are threatening me to complaint a legal case from court. I have no other option.
So it's a request to you to please take an immediate action and save me from this fraud system.