There isn't through the Canada Labour Code.
The employer may look at activating a procedure through its code of conduct or its directive on discipline. However, through the Canada Labour Code or its regulations or under part II, it does not mandate any type of referral mechanisms. There isn't that.
If the employer chooses to look at it through this process and not through any other.... It's optional for the employer to determine which process. If an employee files a complaint through this process, then it means to say they will go through that. You can't hold anyone accountable through this process, legally.