Indusind Bank — Fraud call

Hello, I received a fake call from the number [protected] asking the debit card details. He spoke as a customer care executive and called for card verification. When googling that number i found someone had already complained about that number. I denied to tell the details. Then i called to my bank and told about that person. The bank authority said that we can't take any step on that person even i gave the number.Then for what purpose they have grievance centre and telling good customer support. Hope the Indusind bank authorities will take action on that person.