I've found another option we might have not known before.
Quote:
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Should status inquiries and INFOPASS appointments fail to result in a decision from USCIS, an applicant may file a petition for a writ of mandamus with the local Federal District Court. A mandamus petition seeks an order of the Federal Court Judge to compel USCIS to complete the delayed application within a specified time period. The Judge cannot decide the application himself. A mandamus petition should not be attempted without competent legal representation. Furthermore, an applicant should not initiate a mandamus action against USCIS without first attempting to resolve the delay through status inquiries and INFOPASS appointments.
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http://chicagodispatcher.com/what-to...yed-p128-1.htm