i would say try calling the back door number if you have not already done so maybe you will have more luck
Chase: 877-781-3109 (combining & product change)
Last week i tried combining my 4k former wamu card into chase card, The lady said that she could only move 3.5k of credit to my chase freedom card and asked me if i want to close the wamu card now left with $500 CL, I thought this is a neat trick by chase to regain $500 from each wamu cards that they combile.
But I left it open, it will help to improve the fico score in Util and # of open credit with zero balance. I haven't been using the wamu cards, but now decided to keep it active by charging few dollars worth something on that card... humm, iPhone apps come to my mind (better than gum)