Dv Enterprise — demanding money dv enterprise

I have an work from dv enterprises through the whatsapp they sent work details in different numbers, they provide an agreement with my self, after provide an login and password then after finishing work they demand an money they said i[censored] didn't pay 7000 rupees we will file an case against myself in this situation what can i do sir? And if i pay after they demanding more monday for close agreement please give some suggestions sir