WhatsApp call for eKYC from fake bank official, pressuring to act

Recently I have been out of station. There I had received a whatsapp call for ekyc of my Bank account, exactly my Bank account number was told by him. Presuming to be the genuine Bank official. I told him that once I return to station, immediately I will submit ekyc. He pressurized me to submit same otherwise your account will be blocked. Then again called me to to the things which I am instructing. I had disconnected the phone. He continues to Ring me more than 5 times which I never picked up.