HDFC Bank — false call on redeem points to cash conversion

Address:	560049
Website:	HDFC

Today I got 2 calls from unknown number[protected] and told me that call HDFC Credit card department and we are converting Redeem points to Cash and depositing in your account.
He asked my DateOfBirth as professional Banker and asked my card Expire...

For depositing amount into my account need my Credit Card number (16 Digits). I felt suspicious about that and Lunching a complaint here.

I request some one to take action on this person. As I know in last 12 years I never got a call from credit card depart about asking my card number.