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If you submitted to one category, and it got listed in another, then you can just about be certain that: In the editor's judgment, Based on the site's contents, the category you submitted to was Unquestionably Wrong. Don't waste your time asking for an update unless you've drastically changed the site's contents, or drastically changed it's navigation to feature an entirely different aspect of the site.
Note that what you _say_ about the site's _purpose_ in the update request is a hint only: it will in no way be considered authoritative (or even credible.) We place sites based on the site's content, and that alone. A successful update request would do something like:
(1) point out that the significant content (say, over 30% of the site) that really doesn't fit that category, based on the guidelines in the category and its parent categories
(2) make an alternate suggestion that really fits the focus, the apparent purpose, and the contents of the site (again, reviewing the guidelines in the category and all its parents.)
(3) avoids plaguing the editor with irrelevancies (like desires for income, search engine placement, victory over competitors, effort invested) or (this may seem strange to be a needed tip) outright lies (you'd be surprised what people claim about their site, that they thing we're too stupid to notice isn't true.)
Many update requests, needless to say, are not successful. But if we make an error, this is the official way to let us know so we can fix it: and we do appreciate knowing about errors.