I was having this issue for months! For like three months I have requested to change my plan on renewal date and I didn't see a change. Just refreshed like @hairbag1 recommended and now I see the change.
This may be a silly question but what is the difference between "unlimited Canada-wide Talk" and "unlimited Canada-wide minutes"? My old plan refers to 'Talk' and I can't tell if I'm downgrading if I go with a plan that only says 'minutes'.