Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Before cancelling the subscription, please be careful, you may loose your original subscription.
Log into your Microsoft account on this link and check the subscription that is now linked to your account, is that the new upgrade that you did not order, or the original monthly subscription and is there only one subscription listed listed on oyur account.
https://account.microsoft.com/services/
Then go to the Billing section on the left, do you find the payment for the new invoice you received listed there?