If your Mastercard debit card is lost or stolen, you can block it instantly from the application with one click and make sure no one can use it. You can choose the "block my card temporarily" option to unblock it whenever you want, or the "block my card permanently" option and request a new one via the "replacement card" option. You can also request a new card by calling our customer service, as well as if you wish to change your personal details, address or telephone number.