Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
Based on your description, the charge that includes "G" is often associated with a Microsoft business subscription, which is typically linked to an account ending with onmicrosoft.com or a custom domain.
To review or cancel the subscription, you will need to sign in to the corresponding account. Please try to recall whether you created an onmicrosoft.com account when purchasing a Microsoft subscription.
I also recommend checking all email accounts that you may have used and searching for keywords such as Microsoft, Microsoft 365, subscription, invoice, billing, order confirmation ,etc. This may help you locate any subscription-related confirmation emails associated with the charge.
Since I cannot access billing records or backend account data, I am unable to verify the charge directly. If you are still unable to identify the subscription, please contact Microsoft Billing Support, as they are authorized to review billing records and help investigate the charge.
You can try to find the related hotline number to call the frontline let them raise a ticket for you: Customer service phone numbers - Microsoft Support
If you are able to use English, you may also prefer the following phone numbers:
*(Important Note: Depending on your country or region, when you call the support number, you may hear an introduction of about 30 seconds such as "you can visit the link...". You can ignore this introduction and wait until you are presented with the options. Then press "1" as a business email user, and again "1" for technical help.)
Please try 2 or 3 times until you can reach out to an agent.
For your reference:
How to investigate a billing charge from Microsoft
Finally, while you work with Microsoft Billing Support to investigate the charge, you may consider contacting your bank or card issuer to ask whether they can temporarily block future Microsoft charges. This may help prevent additional charges for a product or subscription you do not intend to use until the matter has been clarified and resolved.
Although I cannot support this issue directly, I hope I have provided enough information to help you move forward.
Have a great week ahead!