I found this information on
http://allearsnet.com/pl/contact.htm
Meg Crofton
President
The Walt Disney World Resort
PO Box 10040
Lake Buena Vista, FL 32830
Al Weiss
President
Worldwide Operations
Walt Disney Parks and Resorts
PO Box 10000
Lake Buena Vista, FL 32830
Those are above the Guest Srevices Department if you rather jus send it to Guest Services
Walt Disney World Guest Relations
P.O. Box 10000
Lake Buena Vista, FL 32830
I had to write a letter about a situation that happened on April 15th I mailed it the 17th and by Monday 21st I had a phone call from Al Weiss's secretary who was making the first point of contact. The situation was that bad that Al Weiss needed to get involved.
If you email a letter it can be received fast but it can easily be deleted. If you handwrite the letter they will know that whatever the concern was it was important enough for you to take the time to sit down , write or type the letter , print it out, stuff the envelope, and spend the price of a stamp to mail it.
They tend to respond but people do get responses from emails just sometimes not as quickly.
I hope whatever was wrong didn't ruin your trip and hope they are able to at least listen.