Trendon Epay Kerala — fraud transaction on against trendon epay kerala

Last month i have received a call from sbi credit card department regarding verification of credit card. Phone no[protected]. As per the lady (Sbi executive), this was a verification call, where i have to provide my information like address mobile no. And card details. Then she asked me a otp which has came to my personal number to provide to her. As a trusted customer i thought it was a real call from sbi department so i had shared the otp. Later i realized that it might be a fraud call, when i got my transaction statement after 15 days. I blocked my credit card. And have registered a fir complain against the same.
Kindly help me in this to get back my money. (7840 inr).
Ps:
It has been a pathetic condition for people of my age (57 yrs) to run daily to bank and to trust people in own country. Still i trust on govt to take step on these fraud companies and to help people like us who are getting cheated for no reason.
Kindly reach to me in any related thing which is need to be provided.
[protected].

Regards,
Umakanta mishra