I had a prepaid account with Koodo and recently changed to a monthly one. At the kiosque when I switched plans I had the same issue as now but, I after trying a few times I was able to login. Now is blocking me again and I can't access my monthly account.
Best answer by David AKU
Contact Koodo directly so they can reset your account. Easiest by PM from their Facebook page or by DM from their Twitter page.