Ask them for Call Control instead. Callers that aren't on the white list will be prompted to press a random button to be connected. Is very effective in screening out the international scam calls.
Why can TELUS not do something about the calls coming in from Belize, Sri Lanka, Bolivia, Greece and now Mongolia!!! I just checked my phone and since 1:00 pm today, I have received 20, yes 20 calls in 2 hours. I have activate the blocked caller on my phone but there must be something that TELUS can do.
Considering the spam callers can fake any caller ID they want, carriers have no way to currently block them since they can't identify who or what is calling.
As I mentioned previously in this discussion, one option you do have for your landline is Call Control. I have it and haven't had a single robocall make it past. Now if you are on a cell phone, there are no options like Call Control at this point.