Best answer by Ranjan Koodo
From what I gather @Olen'ka, there appears to be a discrepancy between the billing address tied to your credit card, and what we have on file. Given that you're a relatively new customer, our fraud prevention triggers are more strict, to ensure we protect our customers.
I would recommend checking the information connected to your payment card and ensure it matches what we have on file for your account. You can also try a different card, try paying over the phone by dialing #227 (as it's a different system, you may have better luck with the same card here), or pay through your bank by using your Koodo account number.