Now that Washington mutual and Chase are officially one-and-the-same, you can simplify your life by combining accounts and getting rid of your old WaMu credit and debit cards.
Call Chase at 1-800-524-3880 and give them your old WaMu account information and they will take care of the rest.
http://www.creditmattersblog.com/2009/03/mechanics-of-converting-and-combining.html