This looks similar to an issue posted by a prepaid customer a few months ago. Your best option is to schedule a callback with Koodo Assist prepaid to get this matter resolved. 

Where did you find that promo? It appears to be an old one.
The one currently displayed on Koodo’s website is: 
 

“Get bonus data when you activate on select plans.

Including a 15GB data bonus every month for 12 months when you activate on 4G plans $45/mo+1and use promo code PROMO15GB12 . Plus, get another 2GB/month when you choose Automatic Top-up. For a limited time only.”
https://www.koodomobile.com/en/prepaid-plans