As @CRoss has mentioned, there are a few ways you can get your question re-addressed. I'll try to elaborate a bit on them, though.
1.) Check to see if the mod and/or other involved users are in the chat room, and hash it out there. Especially if the mod in question is @CRoss, (he's almost always hanging out there) this should get you a fairly quick response. It also provides the quickest means of two-way communication if a discussion of any length is required. When posting your concerns via chat, I suggest posting a description of your issue in one message and a link to your question in its own message. This allows the link to get "OneBoxed" and makes it more easily recognizable. Also, make use of the @Mention function here to call out any mods and/or other users involved in closing the thread. (More on @Mentions later.)
2.) Post in Meta. This will give visibility of the issue to most of the community, especially including the moderators and other avid members who may be able to influence the closing/re-opening of the question. Make sure to include a link to your question. Put the link on its own line (may or may not be necessary, but just to be sure) so that StackExchange can convert it to a hyperlink with the question title as the display text. Also, I'm not sure if @Mentions (more on those later) work in question/answer posts like they do in comments or chat, but it wouldn't hurt to try using them to summon the people involved in closing your thread.
3.) Put a comment on your question. I make this the last option because, in my opinion, it is least preferable to have potentially lengthy discussions placed in a comment-thread on the main site. Still, if this is how you'd prefer to do it, one thing I definitely recommend is using the @Mention feature to call on the attention of the mods and/or other users involved in closing the thread. Their names will be posted at the bottom of your question post if it is closed. Simply include an @Mention of the user(s) (their username, without any spaces or punctuation, preceded by an @ symbol - like @Iszi, @CRoss, @AndrewM) in your comment. This will place a message in their global Inbox, which will be flagged on any StackExchange site they visit.