I Tec — harassment by sending sms and emails demanding money

I was contacted by a company called itec. As i am a student and was in search of part time job, i was really interested by the offer they made. I as promised that i will be paid an amount of 22, 000 inr upon completion of filling 10, 000 captchas in 10 days. I was fine with it. I had to send the photgraph of aadhar card to them via whatsapp. They asked me sign a document digitally. They never mentioned that i had to pay an amount of 5000 inr if i fail to achieve the target, she just said that an amount of 5000inr will be deducted from the salary. The app they provided crashed many times and showed incorrect number of filled captchas. When i searched the internet i found these companies to be fraud. Now, today i received a mail and many text messages asking for money. I don't want to get trapped in this. Please help me.