Greetings!
This is Tin, looks like you need help updating your Billing information on your account.
Just to confirm, you don't have access with your account right now? Are you getting any error message when trying to access it? Have you tried to reset the password already?
You may also reach MS Accounts & Billing regarding your Billing info issue:
Kindly open this link: https://support.microsoft.com/contactus/
Ensure that your MS Account has been signed in
Type "Chat with an agent" and hit Enter.
Please click the "Contact support"
Please select the "Products and services"
Please follow the prompts to connect with a live agent.
You may also choose the "Call me back" option if you prefer to receive a call.
Once you're connected to the Live Agent, please let them know about your issue so they could check your account and address your concern.
Thank you,
Christine L