RBL Bank — Amount charged without my permission

I am not at all interested to renew r shield policy with rbl bank credit card. For that i sent hundreds of emails to rbl bank in last two months, but they never responded. I called their customer care number, but no response from there. And they have charged me 600 rupees in my credit card without my permission. Just cancel that policy and credit that amount back in my credit card. I am not interested in r shield insurance policy.

My contact number is [protected].