Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi ,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
As the Q&A Assist has mentioned, you cannot directly convert a Microsoft 365 Family plan to a Business subscription; you must purchase a new business plan, migrate your data, and then cancel the family plan. Purchase a Business plan, install apps, move data to OneDrive for Business, and cancel the Family plan to avoid double billing.
Regarding the refund, kindly check out the link below to check refund eligibility for a subscription you purchased: