Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Please note that Q&A is a user-to-user forum, not Microsoft support. Contributors in the forum do not have access to account and billing info.
Phone support is very limited for consumer (home use) products nowadays.
Since you may have multiple accounts (@outlook.com, @gmail.com etc.), you can try your various e-mail addresses at https://account.microsoft.com/services and, with a bit of luck, you will find the correct one.
See also https://support.microsoft.com/en-us/accounts-billing/how-to-investigate-a-billing-charge-from-microsoft . You should be able to access chat support from there.