I don't think there is an easy way to delete changeset that has been uploaded twice. You could post a link to the changesets here and someone could probably do it with a script. It looks like there is a revert plugin for JOSM at least: answered 14 Dec '11, 11:02 emj gracias lo estoy haciendo uno a uno
(14 Dec '11, 13:06)
fercema1
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You could add the changeset ID and maybe someone can du it for you.