Common reasons include card not activated, insufficient credit limit or incorrect card details being entered.
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If the balance on your bank account is too low, or you get close to or go over your credit card's credit limit, your card may be declined. If your bank or credit union offers alerts to flag fraud on your account, sign up. These alerts can let you know about some possible problems before your card is declined.
You can directly approach your bank or its branch and submit a written application, requesting an automatic unblock of the ATM card. To verify your identity as the card's user, you must submit ID and address proof. Once these details are verified, the bank will unblock your card.