You may have grounds for a wrongful dismissal if your employer didn’t follow the specific advance notice and severance laws. Additionally, when an employee is not let go, but the terms of the employment are drastically changed and the employee resigns, it is considered an unjust dismissal.
If you worked for an airline, government agency, or bank, the Canada Labour Code’s (Part III) dismissal law states the employee must have worked for at least 12 months. If you worked in the private sector, Canada’s Employment Standards Act (ESA) provides a minimum severance unless you were let go unjustly. If so, there are additional benefits that are greater than the ESA provides.