Data Plus — I'm complaining about the fraud

I have joined them through freelancer and given their whtsapp contact number. Then I got a message and they asked for security deposit. I asked them if it is possible with Rs. 500 only they said yes and when I deposit the money. They said it is not possible and require 1000Rs. More I said refund my 500rs. They just denied and now not replying to my messages. i have all the proofs. Please help me