If you have lost, misplaced, or had your GFA Federal Credit Union Debit/ATM MasterCard stolen or you believe that you have unauthorized transactions posted to your account, you now have the ability to disable your card immediately by simply clicking on the Deactivate button for the corresponding card on the Activate/Deactivate my ATM/Debit card page, found under the Card Service Center tab. If you happen to find your card after you have already deactivated it, you can reactivate it by simply clicking the Reactivate button. If your card is truly lost or stolen you must contact us at 978-632-2542 to cancel the card.