Telus is Stupid

Had my first run-in with Telus today. My bill arrived and was nearly $60 more than it should've been. Turns out that if you change your phone number with them and this isn't done on the same day as your monthly bill, you can get really screwed. In my case, it meant that all of my evening/weekend minutes were said to have been already used (and I don't talk for 1000 minutes, thank-you-very-much).

When I asked, they said that their billing system always does this and always has.

Me: "How can I avoid this when I change my number in the future?"
Them: "Try to change your phone number on the same day that your bill arrives."
Me: "Um, wouldn't that mean that I would get billed for long distance minutes whenever someone called me until I could change my number?"
Them: "Oh, uh, yeah."

I was given no warning and, had I not complained, I would have been stuck with the bill. Also, their automated phone system doesn't make it obvious how to talk to a representative (my experience with Rogers' customer support encouraged me just say "talk to a representative" right at the outset, which worked).

To me, this is really negligent. If you're a phone company, your billing system should be able to deal with a change of phone number.