Someone will probably post a more direct way to do this, but this will work.
Go to disneyworld.com and look for something like "contact us". There is a drop down menu so you can direct your comment to a specific area. Send in your comments and you will receive first a note saying they got your message. Then in a few days, more or less, you should receive a specific e-mail about your comment. We have used this in the past and have always gotten a response. There were a couple of occasions that we also received phone calls from the executive offices of Walt Disney World. Thought it was pretty impressive.