Fundmelon — Delay in the return of principal amount

I deposited 3000 rupees in fundamelom several months back. And I have been getting interest as well. But when I wanted to withdraw the interest amount from the wallet I couldn't. So I cancelled the subscription and Its been atleast 6 months and more and I still didnt receive the refund. I even emailed and contacted the fundmelon customer help center but no help. Please try and resolve the problem. I have no other go but sue the company for delay, no proper information on any updates and fraudulent.