Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Megan, sorry to hear you're having trouble.
If you have lost access to your account then please first contact your bank/credit card company to report it so they can stop any possible payments.
After that please start an online chat with Support via https://support.xbox.com and click on Contact Us so they can open an Unauthorized Access Ticket for it.