Data Entry Farud

My name is Kamal and I applied for an online Data Entry Job in which they promised to pay me money for completing their work. I said that I will do it later but they said that you have to do the registration as the vacancy is limited, so I did the same and they have me signed an agreement in which they said to select 5 December and start work from that time now I didn't know that my time has started and I have to do the work. They called me yesterday and asked me to pay the penalty of Rs. 6700/- otherwise they will file a case against me. Then later today they sent me a notice to pay Rs 6700/- or have to pay 73700/- in the court. They also sent me a voice message to clear the penalty of 6500 or they will a civil as well as criminal case against me. I am an under graduation student. Please tell me sir/mam what should I do.