Reuse gift cards

I have a stack of gift cards that cannot be recycled to use again with a different client due to your system lacking this!

I had to purchase another 200 gift cards in less than a year, this is a waste we should be able to reuse if the client gives the gift card back due to them moving or not being a spa going person, or any other reason. I live in a military town so we have a lot of clients who move every year.