well you can try in the chess.com feedback group.
http://www.chess.com/groups/home/chesscom-feedback
to be honest I contacted the staff several times concerning messages or banners I would refer to as annoying ads but in the end the only thing that happened was that they offered me to get back some money and to not be a premium member from that moment on. chess.com does not refer to certain things as ads.
I am a premium member and I'm getting annoying ads. I have contacted Chess.com 72 hrs ago about this problem and still no response. Is there Adm. that I can contact to help get this problem fixed?