HDFC Bank — Credit card fraud transaction

I had an HDFC Credit card valid from March 2013 to March 2016. As Card was expiring and i don't want to renew, I called customer care around 4 pm yesterday to close my account. She asked me to send a request letter via courier.

In same night in between 11:30 PM to 12:00 AM, I received multiple messages regarding transactions from my Card at Auto care center in Mumbai (separate location). Total transaction amount is 38, 900/-.

After receiving the messages, I called Customer care for blocking my card. During this process, Customer care person informed me that new same credit card is reissued as well as one more special card is issued in my name.
But reality is that I have not received any one of these 2 cards. I blocked both the cards and asked him to lodge the complain for bank investigation. But still not received any ackowledgement or mail.

Customer Details:
Name: Robin Katiyar
Email: [protected]@gmail.com