HDFC Bank — money debited without information

Address:

Jaipur, Rajasthan, 302021

Hi,
Today, around 15:36 pm, Rs.1899 was spent at CPONEASSIS. I have not made any such payment. I did not get any OTP for it. I did not authorize for any such transaction . And when I checked my bank statement I couldn't get any more detail.
I want my money back in my account. Also the reason why this happened. I also tried calling the number mentioned in the message, but they gave only two option either to block the card or to exit. I don't want to block my card, I want my money back .