Bank Of Baroda — card blocked fraud

Address: 401105

My card was lost i had complain to blocked my card whenever i blocked my card i get a fraud call from someone that u had blocked a card for that kindly share the detail of another card means another bank of baroda a/c card number detail they ask us to tell card number of another account and also cvv number my question is that how this fraud company know that i had request to card blocked in bank of baroda it mean tht there is somewhere internally who is leaking a number which has been share to fraud company
Bank of baroda should do proper inquiry of there why this is happening