Oc Technology — Captcha fraud

They offered me a Job of Captcha filling, they told me that they will give me 30, 000 ruppes for filling 10, 000 captcha;s.
I completed all formalities, and started working, on the first day of work I found the app isn't working.
I made this in the companies notice but they didn't responded. They are now asking me to pay 6900 as a penalty for not working and blackmailing me that they will file a case against me. I am a student and belongs to a poor family. I can't pay such a big amount.
please help me out.
you can contact them on whatsapp. their no. is [protected]
my email address: [protected]@gmail.com