ICICI Fraud alert

Need an urgent info.
My brother doesn’t hold any Credit.
Today afternoon (Sun 7th Feb), my brother got a call from ICICI personnel.
She says my brother hasn’t paid his credit card amount.
The pending amount is around 97,000Rs. She even said he has paid the first 2 installments properly.
All the details furnished (address/name/mobile number) was correct.

My bother said he doesn’t hold any credit card from ICICI.
She says he has to pay the amount ASAP.

After this we called back the same number to check the authenticity of the number/call.
It’s in the name ICICI Bank, Bommanahalli Bangalore.
Now my brother is going to lodge a police complaint against ICICI for this menace.

How do we go ahead with this ?