Fz Enterprises — they are blackmail me

Fz enterprises blackmailing me even i completed my work. Iam a student. They tell to pay 9000 rs. What can i do please help me and i didn't understand that fz enterprises and dv enterprise has same address. Please help me iam a student and they msg me and mail me please help meeee. Please solve my problem they have my id proof they are calling me and mailing me please help