For the time being, it is not possible to delete your bonsai Mastercard yourself. Just put them on pause (this will block your card in the meantime). After this, you can send us a message through our support channels asking if we can remove your Mastercard. Put in your message the last 4 digits of the bonsai Mastercard you want to remove and we'll let you know as soon as this is done.
ATTENTION: once the card is removed, we cannot recover it for you.