I know if you spill red wine on clothes, carpet etc, the best way to get rid of the stain is to pour white wine over the red wine stain, not too sure if it would work on your wall though.
Try giving it a once over with bleach/water (50/50) leave for a couple of hours, rinse well then touch up the offending area with the original colour, while its still wet use a damp sponge around the edges of it to blend it into the wall colour
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