I got a call on the 25th from the same number for Citibank credit card.
The modus operandi in my case was that they were issuing a new chip and pin card to replace my existing one.
The OTP was taken in my case too as a confirmation for issuance of new card and I realized that a fraud has happened when I saw a transaction was made to Oberoi EPay kerela for 6999.

I have reported this to Citibank and await to see the results of their investigation.
Wondering how many other people were conned like this by these elements.