How can I refund a CREDIT NOTE if the credit card has been removed from the customers account?

How can I refund a CREDIT NOTE if the credit card has been removed from the customers account?

I have a CREDIT NOTE on a customers account.  This customer is no longer with us so they have cancelled their account.  The customers credit card has been removed from their account and I no longer have the option to void the CREDIT NOTE or to issue a refund.