Does Chase still own the account? Check your credit reports. If the Chase tradeline show a $0 balance and a sold/transferred to another lender, then they no longer own the account and have no standing to take action against you. On the flip side of that, not sure if Chase keeps a black list or not, but if they do and they reconcile it against the purchased WaMu accounts, then I would not expect you would be able to keep a low interest rate or get a CLI especially if the Chase tradeline is still showing on your credit reports.