Nope... Once the full amount of money is used on the card, its worthless. If a retailer "credits" money back to your card after a return of an item... then that money can be used. On another note, a...
Yes you can reload a reloadable visa gift card. Some popular methods are: stores, wage/salary credit, direct debit, and credit card. You may or may not be charged for a reload depending upon the card.