South Indian Bank [Sib] — sib fraud transaction from my account

Dear sir,

I have an account in south indian bank

My account number is *39 and my branch location is ernakulam vennala.

On 12/03/2018 17:39 using my card someone withdraw 500, which time i was on my duty and my card was with me.

When i check in my bank mini statement it is showing that cwdr at sgpalya oatm bng

Even when card is with me all the time. That means somebody using my duplicate card to access my account

I need your advise how to track this issue, can it be bank fault or its a 3 party fraud or its a mistake by bank. I have already logged complaint to south indian bank. How may i claim my money back? Or whether it is malware attack something like that... Plz suggest