HDFC Bank — Suspicious calls

Address: 560076

I received calls from [protected] & [protected] asking for CONFIRMATION of My card Number. After giving the same they wanted other details & I got suspicion & cut the call. Hope HDFC will look into the matter. Also please advice me of any action I should take from my end. When the call came I was in office and busy. However when they wanted more details I did got suspicious and decided to inform HDFC.