Contractor messed up painting

[victorgrant]

Hi,

We hired a guy to patch up a drywall joint crack and paint.Well...
they did a terrible job on the paint. Didn't sand the mud from the
patches, some mud flashed through the paint, other places weren't
properly sanded before painted.What's the easiest way to repair?
Please help.

I didn't find the right solution from the Internet.

References:
forestryforum.com/board/index.php?topic=100385.0
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Thanks