DATASITE TECH SOLUTION, Scammed money by blackmailing

DATASITE TECH SOLUTION, Scammed money by blackmailing
I got a call regarding online job, and firstly they said they don’t used to charge any amount for enrollment. Then they asked for the UID AND SIGNATURE photo for creating user name on the company site for login and they gave 1200 task (form filling), and in each form there’s 3more form mean 3600 form in 9days needs to fill,
After creating sign in page they messaged and said if failed to complete all the task then I need to pay RS 3900 as admin charge,
And after completing 1task ( not fully) , I asked them to close my id because I don’t want to continue then firstly they said I have to SUBMIT RS 3900 admin charge and if I m not submitting then they will file case on me by using my id,
That’s why I submitted RS 3900 and after that they messaged and they will cancel my id untill I m not submitting cancellation charge of RS 4000.
And if I m not submitting it in ten minutes then they will file the case.
That’s I paid it .
So please guide me what should I do to get my money back and also please take legal ACTION ON THIS TEAM SO THAT THEY WILL DO THE FRAUD with other guise.
Thanks

DATASITE TECH SOLUTION, Scammed money by blackmailing