HDFC Bank — MECHANDISEEBS - INR 24000 Fraud Unauthorized transactions

Over two transactions on 17th Dec and 18th Dec, I was duped of INR 24, 000 under the merchant name of MECHANDISEEBS Chennai on my HDFC Regalia card. There was an OTP received for the first transaction which was never shared with anyone and still the money was deducted. With regards to the 2nd transaction on 18th Dec, there was not OTP received and still the money was deducted.