Did you have a pre-authorized payment with Koodo? If you had, they will refund via that method. If you didn't have, you might have to contact Koodo directly and ask a rep to change it for you https://www.koodomobile.com/en/help/things-know-about-cancelling-koodo

As well, make sure you check the final bill (the bill after your cancellation date)

You should still have access to your Self-Serve account within 90 days of cancellation. Have you tried changing your billing address after logging in? https://www.koodomobile.com/en/help/things-know-about-cancelling-koodo