Account Security Problems

How to Handle Unauthorized Microsoft 365 Purchases After an Account Hack

Steve K Sep 29, 2026 868 views

Question details

The user needs to resolve unauthorized purchases and billing issues resulting from a compromised Microsoft 365 account.

Resolve Unauthorized Microsoft 365 Purchases After an Account Hack

Product: Microsoft 365
Device & OS: not provided
Scenario: Dealing with unauthorized charges, unexpected invoices, and threats of service suspension after an account hack.
Observed behavior: Unexpected invoices and billing restrictions are appearing on the account due to purchases made by an unauthorized party.

Before you start

Gather your invoices, previous support case numbers, and all communications regarding the account hack before initiating contact with support or your bank.

Solution 1Recommended

Report to Microsoft Support and Your Card Issuer

Take immediate action to stop further billing and dispute the fraudulent charges by working directly with Microsoft and your financial institution.

Because this involves sensitive billing and payment information, forum responders cannot assist you. You must deal directly with Microsoft Support and your bank to resolve financial discrepancies.

Contact Microsoft Support

Open a Microsoft Support ticket and explicitly identify the charges as unauthorized purchases resulting from a recent account compromise.

Request an Escalation

Ask the initial support agent to escalate your case to the Microsoft billing and account-security teams for dedicated assistance.

Contact Your Card Issuer

Call your bank or credit card issuer immediately to report the unauthorized transactions. Request a dispute or chargeback to secure your funds.

Keep Records: Always retain a paper trail of the incident, including invoices, support case numbers, and email communications, in case your bank requires evidence of the hack.

Solution 2

Secure Your Microsoft 365 Tenant Account

Prevent hackers from making additional unauthorized purchases by locking down your Microsoft 365 account and updating security credentials.

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Frequently Asked Questions

Will Microsoft refund unauthorized purchases made by hackers?

Yes, Microsoft often issues refunds for unauthorized purchases if you escalate the issue to the billing and account-security teams and prove that an account compromise occurred.

Can I resolve billing disputes through Microsoft community forums?

No. Community forum moderators and responders do not have access to backend account-specific billing or payment systems. You must contact Microsoft Support directly via your admin portal.

How can I stop a hacker from continuing to buy services on my account?

You need to lock down your account immediately by changing your passwords, revoking all active sessions in the security dashboard, removing saved payment methods, and enabling Multifactor Authentication (MFA).

What should I do if Microsoft Support is slow to resolve the billing issue?

You should contact your bank or credit card issuer immediately to report the fraud. They can freeze the compromised card, block the merchant from further charges, and initiate a chargeback on your behalf.

Microsoft Office Security Issues