Quote Originally Posted by TheFirstKel View Post
Ask for refund on the ground that you "changed your mind" - if that's possible. You may want to contact your credit card company to say the purchase was made without your authorisation to reverse the charge should the process with SE isn't working.
Was going to say the same thing. Email SE that you didn't authorize the charge and you want a refund. If they don't give you one, dispute the charge with your credit card company, and provide them with any emails you got from SE.

In fact I'd contact your credit card company TODAY to tell them what happened, and ask what you should do. Good Luck.