If there are too many incorrect attempts at entering in the PIN, CVV, expiry, or other card details, for security purposes the card will get automatically blocked.
Here's how to unblock your Venn Mastercard:
Step 1: Go to Venn "Cards"
Step 2: Select the desired card
Step 3: Select "Settings"
Step 4: Select "Unblock card"
After selecting “Unblock card”, you’ll need to finish the process by inserting your card into a payment terminal and entering your 4-digit PIN. If the first attempt is declined, keep trying again. Once the correct PIN is entered, the transaction will be approved and your card will be fully unblocked.