My money is debited without my consent.

My money is debited without my consent.
Yesterday I got an SMS that Rs.899/-will debit from my account and today it debited. How can you debit my money without my consent. Before you debit the money,atleast you should have call me. And my account privacy is not allowed.899/-rupees is not a less amount.I want a refund.

My money is debited without my consent.