Hello, I need a review on a business law case below.

Hamilton Utility Inc. appointed Juan Abrams as one of its corporate officers. Juan rented cars Quality Cars Limited a car rental business. the rental agreement named Juan as renter and he signed the agreement describing himself as company Secretary of Hamilton utility. Juan, however, used the cars for personal purposes and not for company business. Hamilton refuses to pay the charges as Juwan has not been given any authority to enter contracts on its behalf. is Hamilton liable to pay the car rental charges? explain what would be the result if Hamilton appointed Juan as a secretarial position?