We can help you troubleshoot this, Info2223. A good first step is to see if the problem is with your browser.
First, could you please confirm if you're encountering an error when updating your payment method? If so, providing us with a screenshot or more details would be greatly appreciated, as it will help us find a resolution more quickly.
Let's start by clearing your browser's cache. Accumulated cached files can slow down your browser and cause display or functionality issues on websites. Clearing your cache often resolves these problems. Alternatively, you could use a different supported browser and then attempt to update your payment method again.
If the issue persists, the best way is to get in touch with our phone support team. They have the necessary tools to access your account and manage your QuickBooks Self-Employed subscription.
Since you mentioned you're unable to contact our phone support team through your QBSE account, here's how you can reach them: