@Paul based on my experience as a pre-paid Public Mobile customer, I'm guessing it's due to having used up the full cycle's data amount prematurely. It's often cheaper to renew early with PM rather than buying the data add-on(s), as they are priced relatively much more expensively per GB than plan data. That said, I'm not sure how it works on the Koodo pre-paid side--if they allow early renewals or not. @Rene you may want to reach out to them over Facebook Messenger or Twitter DM, or by phone to ask.
Interesting that you were offered the new bonus plans. I tried a couple of weeks ago (from $15 plan) and they were not available to me. So today I moved to Public Mobile for their 4.5 gb data, unlimited Canada Wide Talk, and International Text & Pic Msg for $40. Offer available to new AND existing clients. They seem to include their existing clients in most of their special offers, which Koodo seldom does. I wasn’t sure what to expect with 3G data, but tried different things in different parts of the city and I really could not see a difference from LTE. I have never been with another cell company in my about 10 years as a mostly postpaid client and then recently as a pre-paid, but it was time to leave Koodo. Well I actually still have a line with Koodo (husbands), but the $15 a month plan with a voice booster now and then works well for him as he very seldom uses data.