I didn’t know this until recently, but there is a national do-not-call list you can register your canadian phone number to through the government of Canada:
Additionally, if you’re already a customer with the company calling or have been within a year, they are allowed to call you; HOWEVER,
Next time a company – like rogers for example – incessantly calls you, ask them to add you to their internal do-not-call list, and enjoy your peace knowing that if they call you again, you can report them to the government of Canada. They face possible financial repercussions if this happens.
That vast, vast majority of spam callers are operating out of illegal call centers in India, they’re spoofing phone numbers, and they could not care less that you’re on a do not call list.
Fair enough, but it does help for telephone companies in my experience