If you cannot unblock the card via phone or if it was blocked due to KYC issues, a physical visit is necessary. Required Documents
If unblocked via NetBanking or the App, it is usually instant. If done via Customer Care, it may take up to 24 hours. If blocked for non-payment, it activates within 24 hours after the payment clears. unblock hdfc credit card
Ensure all your credit card bills are paid . If you hit your limit or missed a payment, the bank may block the card until the balance is cleared. If you cannot unblock the card via phone
HDFC NetBanking