The wording on the website and other documentation I have seen indicates that your pre-paid balance rolls over if you top up by or before the expiry date. Sooooo..., no guarantees that the past practice you have experienced would continue.
I chose the automatic top up to prevent this issue occurring.
As a community of customers, we have no insight into Telus' operations, plans, or practices.
I topped up the account yesterday, just a few hours after the balance had expired. I just hope the system has yet to reinstate the remaining balance.
When I was checking my prepaid account, there is now a message as follows:
Your balance of $$$ has expired. Top-up your account by February 28, 2016 to have your expired balance automatically restored.