Phone Number: Questions about eligibility requirements, calculating the CEWS, or how to apply; 1-833-966-2099: Help with My Business Account and Represent a Client; 1-800-959-5525. Yukon, Northwest Territories and Nunavut: 1-866-841-1876. Outside Canada/U.S. call collect 613-940-8497: Change information about your business; Change your business ...