Dfx Enterprises — take strict action against this fraud company

I am a student and i was looking for online jobs on quiker and this "dfx enterprise" employee named amit & manisha called me & gave the details that i need to fill 700 forms in 7 days where only 70 form mistakes are allowed if more than that tend to happen or if i'm unable to submit on time then i need to pay their registration fee 4700 after listning this i said i am not intrested but he told you fill it correctly then you'll not have to pay anything and the salary was 14000 where they take 4700 as registration fee after payment and mistakes reduce amount in salary each form filling carries 20/- after all this when i had some queries they were just calling me but not telling anything in writing... I told them that i am not interested as i thought that this company might not be real & all their mails appear in spam.. They convinced me somehow and also told that when you get registration call don't deny anything pleseeee.. They forced me to do so... Later i came to know this is fraud so i blocked all the numbers.. It has been 2 weeks now they sent me a message telling that check your mails i'm advocate associate mayur joshi where they are threatening me that they will fine complaint agaist me and i need to pay them their registration fee which costs 4700 otherwise i need to pay 50000... Kindly take strict action against this fraud company