Even when I wanted to send a complaint letter to NH....(have *G status with NH) I had to use their service on the website. I was never given a real e-mail address to send to. I will ask NH later at NRT when I transit there in couple of hours.
I emailed via the AMC site and got a reply from this address: anaskyweb@121.ana.co.jp
Not sure how much help it will be, but maybe worth a try. Good luck.