It would be dependent on your bookkeeping procedures to indicate whether you would process a credit versus a refund.
Credits are normally reserved for abnormal circumstances. For example, if a product is out of warranty, but you decided to give the person some money back, or even as a way to give a customer a goodwill gesture if shipping was delayed.
Refunds are tied back to an original transaction in our system, whereas a credit will not.
If you are still experiencing this issue, please contact SPARROW for further assistance.