Hi there, pragatienterpris.
Thank you for posting here in the QuickBooks Community. We aim to deliver customer satisfaction at all times that's why we fix an issue as soon as possible. With that, can you please present a screenshot or additional information of specific errors or problems on the billing page? I appreciate any further details so I can share an accurate solution. Then, please make sure that you won't include any personal details when providing screenshots. This is because Community is a public forum and we want you to avoid getting fraud issues.
Please refer to this article to view various information on how you can change your billing info, payment method, upgrade and downgrade your subscription: Manage billing, payment, and subscription info in QuickBooks Online.
Let me know if you have other questions related to QuickBooks. I'm always here to help.
