The first thing you should do is understand that you were in charge of your money and directed where it should go. The bank had nothing to do with the situation. Since the mistake was yours, why should the bank have to pay for it. You should look at this as an online class that you paid for. Hopefully, you learned enough from the class and you won't have to repeat the class.
Own the debt and come up with a way to pay it back. It's the honorable thing to do. They will still bill you, and if you ignore it, it will go to collections. You'll end up paying for it one way or another.