State Bank Of India [SBI] — fraud phone calls received asking credit card and personal detail.

Address:

New Delhi, Delhi, 110024

I am one of the sbi credit card holder, i have receiving continuously fake calls from different mobile nos. Like -[protected], [protected], since last two week. Every time they offered free rewards points on my credit card and after that they ensure that these points have to converted in case back on the credit card.
After that they ask for my credit card number and expiry date and other personal detail etc. Every time i have warn them please don't ask these kind of detail to me. When i inquired about their business they always immediately cut the phone.in my office who are working with me also received same fake call from the same mobile numbers which are mention above.
I only want to please take some strict action against these kinds of peoples.