Recently deleted items can be restored for DBC by using the Restore Item tab located in the character window (C). As there is now a mechanic in place for players to recover their items, In-Game Customer Support will no longer be able to assist with items that are recoverable. 

Using any 3rd Party UIs may interfere with your ability to see this list.  Please use /loadui to load the Default UI.  If the item you wish to restore no longer appears in the list, it is no longer recoverable.