Super Walmart Center / Green Dot Corporation review: Visa $100 gift card

I brought a visa $100 gift card at super walmart center for a xmas gift, at 10001 southpoint pkwy, fredericksburg, va. 22407. When my daughter try to use it it came back invalid. I had the receipt and took it back to super walmart center to get my money back but they told me I had to call the number on the back of the card which is green dot corporation. On my receipt it shows it was activated by super walmart center but when she try to use it again still invalid. So I call green dot corporation this is the claim # sf-[protected] they gave me. I was told couple weeks I will receive my money. I got scam by super walmart center and green dot corporation.