As noted above, your only course of action is to fill out your return as if you were not a dependent, then print and mail your return.
The IRS will notify both you and the other party to see who has the right to your personal "exemption". Note that the IRS will not tell you who the other person is.
But if you can't figure who did it, then claim Identify Theft (see above) so that you can be issued an ID PIN for next year, without which your returned cannot be filed (so, only by you).
@Rafael Vasquez
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