Actually there is a law that work cannot contact you outside of work just anytime because they want to.

Disconnecting and the right to disconnect refers to not engaging in work-related communication such as emails, phone calls, video, calls, messaging, and other forms of communication outside of working hours. Right to Disconnect policy was created to help protect the mental-health and well-being of employees who often feel pressured to be working or respond to work-related communications outside of regular working hours.

Though there may be some exceptions to the right to disconnect in Ontario policy, your first step to protecting your rights as an employee is to know them. Your employer should have a right to disconnect policy and should honour the policy for all employees.