I had my card replaced in June as well, right AFTER 1 month of using it in Vietnam, China, Hong Kong and Macau. They rang my home number and asked for me by my name, and wanted to confirm with me the last few transactions recorded were ok, so he read out a list of transactions and wanted me to confirm them by telling him how much it was. Lucky I remember the amount. I did ask him what had happened to my account for them to think my card been compromised, and he mention something about a company that tried to charge $1 to my card and followed up with a large sum.