Hire an immigration attorney to help you through this mess. Do you have any records of the attempts you made to contact USCIS about the RFE? Are you sure you updated your address correctly? Just a few considerations. Perhaps an attorney would be able to challenge the denial.
Gunda J. Brost Brost Law Office This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.
You obviously have a serious situation regarding your application for naturalization. If your case was denied, you still have options to pursue. I strongly suggest that you consult with an immigration attorney in Las Vegas as soon as possible to help you.. Good Luck.