Uninsurable vehicle, poor customer service

Our flight arrived late at 2am in the morning just as the Hertz counter was closing. We were given our keys and took out top insurance offered by your staff member. After a long walk to the vehicle we realized how damaged the car was but it was too late to go back as the counter was closed. We paid top insurance for car that was likely uninsurable due to its condition, balled tyres, dents and panel damage all over the car- the car was completely unsafe particularly for the weather but also the long road trips we had planned. We phoned to complian an the lady sounded completely uninterested. We were told the manager would phone us to discuss but received no contact. We are completely unhappy with the service and condition of the car and the amount we paid to insure a vehicle that was already in such poor condition.