I mean, I know it sucks losing money and all, but it's only $6. I doubt your life is going to be so much worse without those extra $6.
Just calm down and wait, they're probably dealing with a bunch of issues now and will get back to you once a proper solution has been fixed. They told you they found the problem, so they're likely going to try and fix it for you and future users.
Although if the content of your complaint emails is similar to the tone of your posts, I wouldn't be surprised if you found yourself waiting a little longer than necessary.