You can shut your debit card off by using online and mobile banking, click here for step-by-step instructions. You can also contact our Customer Care Team at 573-642-3322, 573-447-1771, or 800-446-2265 or visit your nearest bank lobby to close the lost debit card. For after-hours lost or stolen debit cards, call 844-202-5333 so that your card can be canceled to avoid any fraudulent charges.