Who bears liability for damage to a rental boat and can a marina charge a credit card for damage without authorization?

Question Details: I recently rented a ski boat for a day. After returning the boat and the marina telling me I was free to go, I received a call from the marina/boat owner saying I hit something and caused damaged to the underside of the boat in which damage cost would be $300. Then 2 days later my credit card was charged with $600 plus 2 charges of $2100. I understand that I am responsible for damage caused to boat while renting, per contract. I assumed only the initial $300 charge for the damage would be on credit card. What are the laws about unauthorized credit card charges?

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