Once blocked, the card cannot be unblocked. You will need a replacement.
After blocking the lost card, you can request a new one: lost debit card santander
If your card is definitely gone or you suspect it was stolen, you must report it to have it permanently cancelled and a replacement ordered. Via Mobile App or Online Banking Once blocked, the card cannot be unblocked
To avoid losing your debit card in the future, consider: lost debit card santander