Junior with that WAC, I'd call the INS and ask them if your case is assigned yet. With your WAC, you either should expect an approval soon, or maybe you need to call them and make sure your file isn't misplaced.
If I were you, I'd atleast be looking for an answer like "Your case was assigned on .. .", but IIO's at times brush you off and either they lie or their system lies to them, but y'know don't get too depressed if they tell u .. still waiting. But I would call them (yourself), and ask them thsi is my WAC, can you please tell me the status, and if she says still pending, ask .. is it assigned? If so when?
If you cannot get a satisfactory answer thru them on phone, send faxes.