Hello Michelle D,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well?
Sorry for the inconvenience. However, to be able to remove your current Microsoft account payment method, you will first need to add a new payment method to your account and set if for your subscription.
I understand you are unable to add a new payment method. Know that not all payment method is accepted by Microsoft.
When adding a new payment method, you need to enter your name and address as it appears in your account without any abbreviations. If the provision for address isn't sufficient, you can use provision for address 2.
If you make a mistake, rather than correcting it, add a new payment method entering the correct details.
To add a new payment method:
- Sign in with your Microsoft account to the Payment options page of your account dashboard using link below:
https://account.microsoft.com/billing/payments?ref=SMC-4026594
- Select Add a new payment method.
- Select the type of payment method you want to add, add your info, and select Save.
Source: https://support.microsoft.com/help/c39dbc30-bc83-30c8-5ea9-d0d94e6dcfe4
To change your Microsoft subscription payment method and options, see link: https://support.microsoft.com/help/39ab4bc1-01f9-fc28-c3a5-49e87b6e7611
If you are still unable to add a new payment method, I recommend you contact Microsoft support via live chat for further assistance. Kindly go to Microsoft Contact Us website:
http://support.office.com/home/chat
- Type "Unable to add payment method" and click Get Help.
- Click Login and Contact Support at the bottom of the page.
- Log in with your Microsoft account.
- Under products and Services, select Microsoft 365 and Office Option.
- Under category, select "Billing and payment updates".
- Click "Chat with a support agent".
Please let me know if you need more assistance.
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Warm Regards