Oc Technology — Mentally harassment

I have applied for an online job in quickr. And within 2 days i got response from a company named oc technology. They said to do captcha work. To complete 1000 captcha within 10 days with 90% accuracy otherwise i have to pay 6700 as registration fee they told me that they are from govt. Job offers for that reason i gave my all documents like my cv and my aadhaar card as identity proof. Immediately they provide me a link of an app for the captcha work and also give me the agreement letter licence. But as i search in google about this company i found that many people have complaint about this company. So i immediately contact them to cancel my agreement but they refused. I have also mailed but they didn't respond yet. I said that i don't want to do this job but they use to threaten me by saying that they will make a case file against me. Now 10 days have completed they called me and also sent a letter through whatsaap. And said that if i didn't respond within 2 days then they will sent a letter to my home address. They have all my information and documents im scared that they will use it for bad purposes. Please help me to solve this problem and i have attached all those no. S and mail id here.
Their no. S are - [protected], [protected], [protected],
And mail id - [protected]@onlineformfilling.co.in