Linkstar — advocate is calling me on behalf of linkstar

Respected sir,
Myself vuppala gowtami. I got a call from linkstar agent named mihika and she offered me online work and sent me otps she told me that after i tell her the otps i would receive an agreement with terms and conditions and if i'm willing to work with them then i have to sign it digitally nd then i would get working id nd password. But after reading the terms and conditions i called them to tell that i don't need to work and don't send me any i'd they didn't respond nd they send me id and password and when i kept on calling and mailing them that i don't want to work with them they did not agree and now advocate is calling me and asking me to pay15500 rupees or they will file a case against me please help me sir i'm from a poor family sir