it took 8 months to get my passport stamped after my AOS interview.during that 8 months, I called the INS 800number, I wrote three letters to my local INS office. nothing worked. and I do believe what finally made my case done is because I wrote a letter to congress man, they responded quickly and kindly, and it seemed the INS is much more willing to
cooperate with them than with us. I suggest you try this way.