Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Vismay, thanks for coming into the forums. I'm also a user like you and will be more than happy to help you to the best of my knowledge.
Do you remember signing up for a free trial? The charge may be for the renewal. Please log in here using your Microsoft account https://account.microsoft.com/billing/orders to see what are the charges for, if you don't see it, your card may be associated with another account such as from a family member.
Please click the link below for the complete guide on how to investigate a charge, you can also use the inbuilt troubleshooter by clicking the Start button. This troubleshooter also helps you contact Microsoft support when required.
https://support.microsoft.com/account-billing/398c5328-364c-d5e4-ea8f-f5ad60562a93
I hope this helps. If you require further information, please don’t hesitate to get in contact. I will be more than happy to assist you further.
Kind Regards Myk