Csr — threatening for money and sending msg for legal notice

I got a call from subir phone no.+[protected] on 21/08/2019 and he told me that offering me a part time home base job of captcha typing saying that if i complete 90% of correct captcha within 10 days will earn 17500/-. And i'm agree to join then. Then he asked my pan card me for the selection and i provided this to him through whatsapp. Within one hour he send one online agreement mail then i signed it but while singing the agreement i told them that i can't do this job now i will do it in first week of sep 2019 and he agreed for that after that he was called again for confirm the job. After that i got the call from company that my user id is sent on my email id but i told her i can't do it now then she told me ok you will get the call to cancel it but i didn't got the call but still i called them but it was out of service then after that incident i got another call from adv rane saying that company has registered complaint against me and send me legal notice on my mail id - otherwise they will file a case against me. Now i am very much afraid. Please do the needful help i and take strong steps owards such a fake company.
They haven't send me link on which i have to work

I have all the call recording