I'm not entirely sure this will work for you, but are you on the federal Do Not Call list? Of course, it doesn't really work. But if they DO call, you can then at least issue a formal complaint. From what I've seen, one of the few things the CRTC has been doing lately is going after a lot of these guys.

The joker in the deck, though, is that if you're doing business with the irritating caller(s), they may have the right to contact you as part of your existing relationship. 

You've got nothing to lose in trying though. You can find out more here. 

I’ve never done this before: How do I block “Forward Power?”

I did get your complaint, although there's no edict here about using the "F" word. It's discouraged but not verboten. However I have taken note of the problems surrounding this particular complaint and will address the poster one on one. He has a tendency to occasionally fly off the handle, but for the most part makes some interesting points in many of his posts. 

He occasionally gets a bit emotional over some things and that happens. But I hope he will tone it down in the future. There are rules for this board, which were actually written by its former moderator, Iain Grant. You can read them here if you like. I left them mostly alone, but I added one: It's OK to disagree. It's not OK to be disagreeable. 

I've worked really hard to keep civility here and for the most part have succeeded. Believe me that's not easy in the world of social media! I hope we can keep it that way in the future. So thanks to all who wrote me about this. You've been heard.  

Just to be fair, I believe he was referring to India, not Indigenous people. A lot of telemarketing schemes and robocallers originate in what's called "boiler rooms" in India, and that's why Canadian authorities have so much trouble stopping them. So in this case, I believe the term "Indians" refers to someone from that country and not the original residents of Canada. 

That does change the context somewhat.