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What should I do if my credit card is lost or stolen?

If you lost your Mastercard credit card or it has been stolen, sign in to your online bank and: 

  • Temporarily lock your card until it can be found, or 
  • Cancel it immediately and request a replacement card 

You can also call customer service 24 hours a day, 7 days a week at: 

  • 514-281-3159 for the Montreal area or collect from outside Canada, or 
  • 1-800-361-0070 toll-free in Canada and the United States 

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