"REPORT FRAUD TO THE CANADA BORDER SERVICES AGENCY
If you choose not to contact your MP, you can report fraud by telephone completely anonymously to the CBSA. Here are some directions to follow :
(1) Please phone 1-888-502-9060. This is the phone number for the Canada Border Services Agency (CBSA)—Border Watch. The office is located in Ottawa. It is open 24 hours a day, 7 days a week. It is the main federal agency that enforces Canada’s Immigration Act. (The CBSA does provide a rough address : Canada Border Services Agency, Ottawa, K1A OL8. You can send material to that address.)
(2) You will hear a voice message system. Press “1” for service in English. You will hear another voice message which will give you a number of choices. If you press “1”, you will get to speak to an agent. Please tell the agent what you want to report. If you prefer to leave a voice message, press “2”. If you want to FAX information to CBSA, use the following number : 1-613-948-4848.
(3) Give the agent as much specific information as possible on the individual or group. Remember that you do not have to say who you are. All information you give will be held confidential. According to the CBSA, the following are minimum requirements in the information you should give them: (a) the complete name(s) of the person or people committing the fraud; (b) the age or date of birth of the person; c) the kind of fraud the person has committed. Explain the latter very clearly and in as much detail as is necessary. Please try to provide other important information such as the country of birth, home address, work location, etc."
http://www.immigrationwatchcanada.org/take-action/report-fraud/