HDFC Bank Securities — unauthorized sms charges debited

Website: HDFC securities

I have a trading account with hdfc securities which was recently opened by me. I received a call from their office asking about activating of sms alert charges and that a representative will visit me shortly to explain the details & charges for the service. I waited for someone to come & explain the details, however, no one came. On the next day, i noticed that a charge of rs 2075.32/- had been debited from my bank account towards sms charges by hdfc securities.

I have not approved this transaction, nor did anyone explain it to me. I have called & informed hdfc to withdraw this service and to reimburse the amount. I have also written to hdfc securities on this, but have not received any response till date. I would like these charges to be reversed, since i have not approved this.

Kindly do the needful