A company double charged my debit card, what can I do?

I rented a car last weekend and took it back on Monday, 4 Jan. They were supposed to charge me $159.00. I found out the next day that they had actually charged me $318.00. When I called them they first said that they had “released” the other $159.00 and my bank was holding it. My bank said that they transaction was complete as $318.00 and no funds were showing from the company yet. Then the company said the money would be back in my account in up to 10 business days. I’m currently overdrawn because of this. My bank is aware of the problem and has removed the overdraft charges, but I’m still carrying a negative balance until the money goes back. Do I have any legal recourse? The car company is kind of blase about this, but the fact remains that this amount was not supposed to be charged in the first place. Should they not just fork over the $159.00 and get the other back when it hits my account? Doesn’t this violate some kind of law?