Solitaire Technology — Fraud company - Data Entry Work

Sir, I am student and I find a data entry job on google and they give me an online agreement but I am not sign in any paper, forwarded my Aadhar card for verification. They give me 1400 forms, which should be completed in 10 days. I completed and submitted assigned work within stipulated time limit. After submission they informed 15% of work done out of 1400 forms are incorrect and because of mistake you have to pay now Rs. 7100 registration fees. For working around 1200 forms earning became nil ??. They are threatening me via court notice. What should I do now?
Form - Solitaire Technology
Helpline mail id: [protected]@gamil.com
Helpline No. [protected]/[protected] Mob No. [protected]