Call them, sending SM's which are getting answered with an algorithm isn't helping anything. You need to get actual eyeballs on the account in order to have any chance to keep it, even if only to liquidate the URs.

As far as wehre to move to, I would recommend AMEX, which specific card is dependent on where you spend generally is. I'm partial to the Gold Card, but that is just my opinion. I won't get another card with Citi after fighting for three months to keep my DoubleCash after I moved.