Rental car return to different location and charge more than what they initially said.

My friend took a rental car from Michigan from Budget. He drove to New Jersey for vacation. During his vacation while playing basketball he sustained an injury to his leg and couldnt drive the car back. We inquired about returning the car in New Jersey and the first customer care representative we spoke said you can return and with no additional charges. Thus we confirmed returning to a location. By the time we reached the location it was closed and we looked for another location near by. After dropping the car at the location; they gave us bill of $1200; the initial charges were something above $200. When inquired about this, the person said that this is the extra charge for returning in NJ. Called up the customer care again and this time they give a different story. Also they say they dont log calls and cannot find our previous call we made. They say they cant trace the call and we've to pay the remaining amount. What can we do here? It was like lying and taking money.