I Tech — I am trapped in fraud case by itech

I am trapped with a fraud captcha filling work. With the company i tech. They are now threatening me to pay rupees 18880.
They have sent me a agreement copy also. And said i have breached the agreement. And now they are going to file a case against me. And sent me a bank account number named xcel network. As per the contract they sent me if i fail to complete 10000 captcha i have to pay 5000 rupees penalty. I have already paid 7500/- as penalty and then they called me again to pay 18880 rupees for digital signature. I am a student. They are calling from various numbers. Now they sent me they are going to file case against me in section 73 and 74. Please help me. And save me from this fraud. I am a student. My whole career is on threat. Please help me. I am also attaching the last msg they sent me.