Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Sorry to hear that you have troubles with this situation, could you please first confirm that this charge appear in this account at:
account.microsoft.com/billing/orders
If appears there, you can request the refund following the steps listed here:
If it does not appear there, will be necessary to know if the purchase was made trough Microsoft site or a third party like Apple or Google, as in this case it would be necessary to request the refund through them.