Depends on why you are trying to contact them.. If there is something you want to buy try 407.363.6200 which is the merchandise number - they can generally track down anything sold on property, and if it is a specialty item (like arribas bros.) they can help you get in touch with the right folks.
Outside of that, if you lost something in one of the stores, I believe you can call CRO and have them transfer you to DTD guest relations, anything lost at DTD should go there. (I lost my id when I was there in April) and guest relations will be able to transfer you to a specific store if you need something else. The art store is called The Art of Disney and the scrap store is called Disney's Wonderful World of Memories.
Hope that Helps,
Heather