To successfully set up your payment method, please ensure your billing address matches your region. Since you are paying for a client’s account located in Australia, you must use a card linked to an Australian address to avoid any processing concerns.
For more information, you can refer to this article: Manage billing, payment, and subscription info.
Additionally, since you're seeing accumulated charges for past subscriptions, I recommend contacting our Live Support Team. They can look into this matter further and provide other options to resolve your billing issue.
Feel free to get back to us if you have other concerns.
