Call Union Bank customer care immediately and request ATM card blocking
Use Union Bank mobile banking app to block or hotlist the card
Use Union Bank internet banking to disable the ATM card
Visit the nearest Union Bank branch and request card blocking
Send the required SMS command to Union Bank if SMS blocking is supported
Use the card control or card management option in the bank’s app or portal
If the card is stolen, also file a police complaint if required by the bank
Ask the bank to confirm that the card has been permanently blocked
Request a replacement card if needed