It seems like there may be a discrepancy between what your account shows and what you are being billed for. To resolve this issue, you should contact Microsoft 365 Support for assistance in correcting your account details. They can help clarify why your account shows Microsoft 365 Basic while you are being billed for Microsoft 365 Family.
Regarding OneDrive usage, you can use OneDrive on multiple devices, including two laptops. As long as you are signed in with the same Microsoft account, you can access your OneDrive files from both laptops without any issues.
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