Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello, I understand that you are trying to cancel your Microsoft 365 subscription but you do not have access to your account.
Have you tried the sign-in helper via aka.ms/sign-in-helper?
You can try the sign-in helper again if your account is not found. If you know your username and password, but they have stopped working, read My username and password have stopped working.
If you will really be unable to login or recover the account, the best option is to reach out to the bank and block any future transactions that is related to the Microsoft 365 subscription or have your card be replaced and this is to avoid any related charges in the future.