It depends on the specifics of the circumstance. The CBSA could seek for that individual to be removed from the country. CBSA could contact the individual and inform them that they need to leave the country. It could go after the individual in terms of some level of prosecution, whatever that is. Obviously, we would put flags in our records for if that person ever reapplied in the future.
We would also look at that person's immigration status or immigration documentation, of which there are many types, as you know. For some documentation, we have the ability to withdraw that documentation. For others, there are more legalistic processes to follow. It would all depend on the situation and the seriousness of the action, offence, or misrepresentation.