I don't know about Canada, but in the US you can't even count on that ending the issue. They'll attack your credit for not paying.
Exactly. Some people's credit ratings have been ruined by things like this, and their lives have been severely impacted - being denied an apartment (credit checks are standard for new tenants), being denied loans, students being unable to pay for tuition/books, and a long list of other issues that stem from these shenanigans.
I was more suggesting it to break through their script and get them to actually pay attention to what you're saying. That said, attacking the credit of a dead person is useless.
The problem is that they don't just do this to dead people. They harass people who are responsible for settling the dead person's affairs, and even people who aren't. When my dad's girlfriend died, she owed money on her credit card, and because she'd been using our address to get her mail, we kept getting calls and letters, and my telling them she was dead and to contact her next of kin in Ontario didn't seem to penetrate.
Then they tried threatening to repossess the stuff she'd bought. I told them I'd save them the trouble - I'd bundle it up myself and come downtown and dump it on the floor of their office, and when would it be convenient to do so?
Eventually they stopped with the phone calls and opted for letters. I took them to the post office and told the clerk to stamp them "Return to Sender" and put them back in the system. When the clerk asked for a reason, I said, "Because she's dead."
The clerk's next question was, "Did she leave a forwarding address?"
So apparently "she's dead" is something too complicated for even a local postal clerk to understand. I informed her that I had no idea where the body was, only that it was probably in Ontario - either cremated or buried, or for all I knew, stuffed and displayed in her son's living room.
Anyway, eventually the calls and letters stopped. Whether the son settled her debt or they gave up, I don't know and don't care.