There are three options for this:
You can block your MasterCard yourself through the Advanzia website: www.mycapitolcards.com;
You can contact the Advanzia Helpdesk by telephone on +352 26 15 74;
During office hours, you can ask your trusted ABN AMRO contact person to block the MasterCard for you.
Please note! You cannot have your MasterCard blocked through the Belgian Cardstop number. We therefore recommend that you save the number of the Advanzia Helpdesk in your telephone.