There is no formal appeal process if your application for a Temporary Resident Visa is refused.
You can apply again. Make sure that you provide any information or documents that were missing from your first application. If you do not send new information or if your situation has not changed, the new application will probably not be accepted.
Canada has privacy laws that prevent Citizenship and Immigration Canada (CIC) from discussing your application with someone else, unless you give written permission. If you want a representative or an agent to help you with an application, you must notify CIC in writing. For more information about using a representative, see the Related Links section at the bottom of this page.