Canadian immigration laws are always enforced strictly and even minor failures in meeting the legal and regulatory requirements will lead to rejection. These rejections are communicated to you by way of a refusal letter. If you receive such letter informing you that your application has been rejected, you should not panic as there are options for appealing the rejection. You should, however, note that there are strict time limitations within which you must act in appealing the rejection. These time limits vary depending upon the nature of your case. The remedies (or options) that are available to you also vary depending upon the class/category under which you initially applied.