I posted here my GC interview experience a while ago (in May). I was not given a dicision due to my old A-file missing. Well, right after the interview I started calling Senator's Office, wrote a letter to the President and to the Ombudsman of USCIS, and they finally found my other A-file, merged all of them and approved my case!!! Now waiting for the actual GC in the mail. Thank you to everyone! 