What legal action can I take against a company that fraudulently charged my account?

First off I think you need to contact the company by phone then certified letter requesting them to stop charging you account and let them know that you did not authorize them for these payments. They may refund it to you, if not you let your bank know that you want to protest all the charges on your account they will have you fill out a form stating you didn't authorize the payments and will do the investigating for you (though there fraud protection), if it comes back factual that you didn't authorize the payments they will put the funds back into your bank account.