If you have any queries, or require any additional information, please contact us. Customer Solutions 1300 734 543 within Australia Fax 1300 369 905 Hours of operation Monday to Friday - 8:00am to 9:00pm Saturday - 8:00am to 8:00pm Sunday - 8:30am to 8:00pm Australian Eastern Standard Time (AEST). Write to us Latitude Eco MasterCard GPO Box 140 Melbourne VIC, 3001 Lost and stolen cards - 24 hours every day 1300 734 543 within Australia MasterCard international +1 636 722 7111 from overseas Please help us improve our service to you. We know that sometimes things don't go as well as they should and problems arise. If this happens to you please let us know so we can fix the problem. Click here for information on how to make a complaint.