well, I'm sure you've heard the saying "the squeaky wheel gets the oil".
If I were you, I would make a lot of noise - its really amazing that they are not answerable even in this case, when they have themselves moved the date to 4 months beyond your RD......
I would even write a letter to the president - it can't hurt right?
It depends how desperate you are! I've heard of such cases where the files were lost, and found a year later! Are you prepared to wait another year?
I'm sorry - Can't think of anything constructive to tell you - except keep writing/calling until someone listens to you....