There can be multiple reasons why your application for temporary or permanent residency in Canada can be rejected by the IRCC. However, you can challenge the decision made by an immigration officer if you consider it to be unfair or wrong in terms of the law. You can also question the decision to refuse your application if you find your requirements favorable for such approval.
IRCC’s decisions regarding applications can be presented to the Federal Court where the merits of your case for leading to a hearing will be judged first. At this stage, it will be checked whether your application has any errors in fact or if its evaluation generates any serious questions of law. In case your application is found to have a good amount of evidence favoring your approval, the case will be presented at a hearing. Moreover, if you are refused sponsorship, you can present the case to the Immigration Appeal Division, while for the refusal of a skilled worker application, you can contest it before the Federal Court.
For these processes, you can hire an immigration lawyer in Canada who will write to the Canadian Visa office asking for the particular errors in the application for which it was refused. Upon receiving a sufficient response, the lawyer can help you navigate through the legal matters or understand whether you should go for contesting further. The cases rejected by the Immigration Appeal Division can be again presented before the Federal Court for reconsideration. At the same time, the refused applications submitted to the immigration department of Quebec will be presented before the Superior Court of Quebec or the Tribunal administratif du Québec.