So sorry - that's scary that they can up it that much! I like Chase's pay-by-phone feature b/c it's posted immediately and there isn't a fee for using it. I'll even make a couple of payments some months if I get a larger paycheck and know that we've put some extra charges on the Disney card.... and so easy b/c it only takes a minute or 2, no writing out checks, stamps to mess w/, etc.... Maybe for future reference......
I really hope you can work something out w/ them or get your balance transferred - that is one way to get them to lower it, btw. If you transfer your entire balance, they think you're going to leave and may re-offer you a 0% balance transfer or lower you interest rate.... Best of luck!