Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
This forum is public, no one from here has access to your Microsoft Billing account.
To help narrow this down, is this a personal Microsoft 365 subscription or a business subscription, and was the September bill actually charged to your payment method?
Since the account was cancelled on September 11, the September 1–30 bill may still have been generated depending on the billing cycle.
Please check (Personal Microsoft account):
- https://account.microsoft.com/services to confirm the subscription is cancelled.
- https://account.microsoft.com/billing/orders to check the exact charge date and amount.
If the charge was already taken, the refund eligibility depends on the type of Microsoft 365 subscription and when it renewed.
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Thanks!