Telephone the issuer immediately. They will 'stop' the card and issue a replacement. It is therefore very important to keep a note of the telephone number and card number separate from the card. You can register your cards with a card protection company for a fee and with one call, they will deal with the cancellation and replacement on your behalf.
Some issuers also offer insurance against loss and misuse.
OK, click this button for a feedback form. All rights reserved.