O Tech — blackmailing for money

Hello
I have seen work from home in quikr
So i have applied to them after some time they called me and said that they will provide work they said 10000captcha codes to be entered and should maintain 90% accuracy. They sent me one app and said to install it and said to upload a pic and sign. I have done it after some time they sent me a bond with my sign and photo without informing me and without my permission he careated a bond after two days i saw in online about o teach and came to know that this is afraud company and i called them and messaged me but they didnt gave me any response
After 7days they started calling me and sending mails to pay amount with mentioning that he is an advocate
He is calling me and harrasing me to pay amount otherwise we will file a case against you he is saying. I have been facing a lot problmes with this fellows soo please help me out from this.
I am a student belongs to poor family.