Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Honestly, if you don't remember your username, password or even phone number associate with the account, I don't think anyone can help you.
The most effective way is probably to contact your bank, and cancel the card, and if they give you a new card, make sure you tell them to stop the automatic card updater service, otherwise charges can automatically carry over to the new card.