Did they ban you for misrepresentation ? Providing false information to immigration while applying for a visa is a serious offense as indicated below from the IRCC web site
If you send false documents or information, we’ll refuse your application. We could also:
forbid you from entering Canada for at least five years
give you a permanent record of fraud with us
take away your status as a permanent resident or Canadian citizen
have you charged with a crime or
remove you from Canada