same here
I just called TSC. The lady on phone was very patient. But, she gave me similar answers.
I referred the case of "expected" -
http://www.immigrationportal.com/showthread.php?t=261980 - and asked if my case is stuck with IO who is no longer with USCIS?

She said my case is not yet assigned to an officer and there is no visa number assigned, so I will have to wait till Oct.
I am still hopeful after recent approvals. It looks like they were assigned visa lately, irrespective of any visa bulletin. Just cross your fingers, say your prayers and hang in there.
Of course, follow up every way you can, i.e. call, SR, congressman, senators.
PS: There is no use of asking on phone, "Why other cases are being approved". They have standard answer, we cannot compare two cases. I doubt that anybody can solve this mystery

, unless we start any campaign and convince USCIS to answer this.