Highly think it was just a "HOLD" put on your visa prepaid card. If you were verified already and could send them proper documents showing it was a prepaid card they will release the funds into your account or drop the hold and credit your prepaid back (however you will be paying the fees like .50)

I know for a fact that those gift cards dont allow INTERNATIONAL purchases thats why it was a "hold". Hero or any MERGE site wont take it and you will be credited back within 3-7 business days. You could bullshit your way send them everything you have documentation wise and maybe they allow it to go through but I think its HIGHLY unlikely since the card cant be processed for anything international therefore they wont be getting the money and there certainly not going to just credit your account and let you freeroll...

Just be patient keep the receipt for the card and your balance will be put back on your card