I had to do the same thing for a Sapphire Preferred application recently. Waited 14 days without a peep from Chase, had a trip coming up, so I called.

I started with Chase Card Member Services:
https://www.chase.com/online/Credit-...er-service.htm

The U.S. phone number listed here is 1-800-432-3117

When I called, they quickly transferred me to the correct place and I got card approval. The rep said that the delay was because Chase has been very busy with new card apps recently (for the Sapphire Preferred).