Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi,
Please try this link to get in touch of an actual Billing agent, who are dedicated agents for Subscription support.
https://www.microsoft.com/en-au/microsoft-365/business/sales-support#
Click Chat Now > Choose Personal:
I am afraid Microsoft does not have a callback number for personal users.
I hope this information helps. If you have any more questions, don't hesitate to reach out. Wishing you good luck!