your case is very much same to my case . I came to USA in 2000 and did
the all papers and fingerprint in 2001. In 2003, I sent my I-751 to USCIS.
after that no response up to 2005. And then I did applied for N-400 in Feb
2005, also no response up to Nov 2006 since in July of 2005 that I passed
the interview. Anyway I didn't get any response except I went to CIS
office asked them.Up to today my passport I-551 sign is I-751 & N-400
pending. now I did a lawsuit ( pro se), In 1-7-2007 it was the due time
but AUSA called me that they made a extention time of 2 months, I said
yes.
Now I have to wait after 2 months that will get finish of the case.
I am pretty sure things will resolve for you as well. I could not believe my ears when the immgration officer told me on the phone that they will do the fingerprints, I-751 interview, N-400 interview, and the oath ceremony in the same day. They obviously do not want to go to court for such loosing case BUT they will squeeze you till the end. We filed the WOM on Sep 20th and the interview is scheduled for Jan31st so they kept wasting time for 4 months and 11 days after filing my case. Good luck and keep us posted. I can not believe that my 7 years nightmare with CIS is about to be over. I am not dropping my case till I have the certificate of citizenship in my hand.