It sounds like at some point, either for a promotion or other reasons, you linked your Samsung account to your brother's Epic Games account. Once these accounts have been linked, its permanent and cannot be undone. Your only option for changing the linked accounts is to create a new Samsung account to link to your own Epic Games account. As far as correcting the purchase or gaining a refund, Epic Games is the only point of contact that could help. I apologize for the frustration and inconvenience caused.
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