OneVanilla OneVanilla Prepaid MasterCard Fraud when you register their prepaid card Nationwide

I purchased a $500 OneVanilla MasterCard from Walmart on 06/03/17.  I went to the OneVanilla website on 06/04/17 to check the balance and register my zip code so I could use it for online purchases.  The amount of $499.94 was then taken to purchase a card from giftcards.comllc on at 3:43 p.m.

I was not aware of this transaction until I tried to use the card on June 21st and my purchase was declined.  When I called to check on the balance it was $.06.

I have been trying since Friday morning 06/23/17 to file a dispute and I keep being told they will send me documents to file a dispute but I have not received them yet.  I've talked to 4 different people and they all tell me something different.

I had a Walmart cashier tell me they couldn't sell them at the register any more due to fraud.  I wish I had not purchased the card.  I'm getting the run around and I need help with what to do next.