Here's the letter:
We’re sorry that you have not received the appropriate responses from our editorial staff. We have a rotating group of fiction readers managing what you correctly identify as an “avalanche” of slush. While we cannot respond more specifically to your request for a status update on your story, it is safe to assume that since six months has passed since your last submission you can consider your work free to submit elsewhere.
As for your statements about your need to believe that the New Yorker isn’t “stacked against the emerging writer,” a perusal of our back catalog will prove that we have discovered and nurtured the careers of many new and exciting voices in literature.
And my response:
I didn't mean to touch a nerve, I just wanted to be honest. I'll keep plugging away until I'm one of those new and exciting voices in literature you speak of.