Statistics Canada surveys are conducted in person, by telephone or electronically. For many surveys, Statistics Canada will first send an introductory letter to let you know about the purpose of the survey and to inform you that an interviewer will communicate with you.
If you have not received such a letter, you can verify that the survey is indeed conducted by Statistics Canada:
Don't be surprised if a Statistics Canada interviewer shows up at your door or contacts you by telephone in the evening or on weekends. To accommodate the respondents' busy schedules, our team of dedicated interviewers works at different times of the day, and sometimes seven days a week. For a telephone survey, you could also be called from different areas of Canada.