Hi there,
We appreciate you writing to us. Happy to help!
For your future reference, please refer to the article below on how to update your billing information
https://helpx.adobe.com/manage-account/using/update-billing-information.html
In case you are still unable to update the billing information with the help of the link, feel free to contact us via so that our support team can help you.
https://helpx.adobe.com/contact.html?rghtup=autoOpen
If you are not able to get to the chat window, then disable your adblockers, firewall, enable cookies/scripts on your browser. If it still fails then change your browser/machine/network.
Please do not share any personal/confidential information like email ID, bank details, etc here. This is a public forum.
Hope the information was helpful to you. Please let me know if you have any further questions.
Sincerely,
Rashmi Swain