This was a wasted morning.
Got a 35K bonus offer for Delta gold AE last week, instantly approved.
Very next day got a mail offer for 50K bonus miles; called immediately, and was told "when you get the card and call to activate, explain you want the 50K."
Ha. Four (heavily accented) operators later (each wanting the entire story), I was specifically told "you must cancel this card and reapply with the better RSVP#"
Did so. Second application refused (yes, duh; should have known).
No way to work through very bad phone tree systems for a supervisor or knowledgeable rep.
(Probably dodged a bullet, seeing the total lack of customer service, but this should have been easy to do; Chase was able to adjust a new cc for a better offer with a simple phone call.)