How can I record a refund to a customer after the credit note has been applied to the original invoice?

Situation...  Vacation Renter pays damage deposit (along with rent, all on same invoice).  Want invoice to show receipt of Damage Deposit (amount of deposit entered as Credit Note rather than payment).  When renter leaves home and is due the return of the damage deposit, would like to record "refund" against the credit note.

Thank you.