An 'Unbilled' charge hasn't yet appeared on your monthly bill. It's the amount that is incurred between billing cycles.
These charges will vary and may include charges for U.S. roaming, extra monthly usage and premium messaging. These charges are incremental to your regular charges for your monthly plan and add-ons.
For your up-to-date account information, including the amount left on your spending limit, call *611 from your Koodo phone or log in to your account on koodomobile.com/selfserve