HR has decided that they will no longer call candidates to reject them
Hell, in my years I've gotten maybe one rejection phone call or letter per 25 interviews at the minimum; in my searches for the last 3 positions I've gotten NO RESPONSE WHATSOEVER from the companies. The recruiters I went through didn't get any feedback from the companies either; we just gave up waiting to here something from them and looked elsewhere.
Be like every other company in America today - just ignore those you've passed over.