That should have been incoming calls, incoming calls will display your own number, since for the security of other people, Koodo can not display on your bill their numbers... And if those calls were charged, most likely you were over your minutes at that time already.
This causes a lot of confusion. If the incoming number isn't blocked there no problem showing it on the bill as it was delivered to the call phone. If it is blocked, easy enough to indicate an incoming call from a blocked number.
Those numbers are misleading, and have different reasons, but usually show up as paid when the base airtime is over, and start to count from your credit, the best way to avoid this is to make sure to have your calls in the off beak hours if you're eligible for this.