Citizenship interview cancelled?

I received my citizenship interview letter September 21 2010 that my interview will be on November 8th 2010.But then I received a letter mid of October 2010 that your interview had been cancelled due to unforeseen circumstances. I went to the immigration office they told me you will receive a reschedule in 30 days. I waited 30 day did not receive anything. I have not received anything it’s been 4 months I have taken info pass and been back there 4 time no answer. I wrote to my congresswomen she got a reply from them saying it’s in background check and there is no time table can be given. HELP GUYS what should I do now.