Bell Canada sells lists of their former customers and their personal contact info to the Canadian Marketing Association - and from what I've learned the CMA outsources this information to call centres that will annoy the fuck out of you.
To be removed from the CMA list and be placed on a 'Do not call' list, follow this
removal link.
It apparently takes 6 weeks(!) to be added...and you have to re-apply every three years to be renewed.
Un-fucking-believable!