Click the Gear icon in the upper-right corner and select Account and Settings.
Select Billing & Subscription tab and go to the Payroll section.
Look for Payment method and click Edit next to your credit card information.
Enter the updated details in the Payment Information window/drawer.
Click Save and Done.
You can also use a private browser when updating the billing information. It doesn't store cache files which gives us a hint for any cache related issues. Using other supported browser can be a good alternative, too.