Have you tried to top up using the incognito mode of the web browser?

as well, Has that debit visa card worked in the past?

No, why incognito mode should help? And yes, Visa was and is used regularly.

Normally incognito would help to avoid old cache of the web page, that will help to rule out issue with your phone/PC cache problem.

Hi there ​@Eugene Rizsky 

Does the message happen when you register your Credit Card or when you purchase the top-up ? If it is a different Credit card than the one registered on the account, you might have to update it. More details here: https://www.koodomobile.com/en/help/topping-your-prepaid-account