Fox Rent A Car review: Rental car overage

I was over charged for an extra day because NO one was at the terminal to check in cars. I told the man at the counter since he was the only person on site at 1:50 am on Thurs. 3/6. I called customer service to try and help be but didnt understand the first rep. I asked for a supervisor and her name was Hazel, she was very rude and I will file a complaint up the ladder on her. My one question is, there saying I didn't return the vehicle until 4:47 am. How did I make my 5:05 am boarding with a 2 1/2 yr. old in a stroller? The person who was supposed to have checked in my car was named Terell, what time did he start work? he wasn't on duty at 1:50 am. Plus if he was on duty, where was he until 4:47 since I was the first car in the return lane? All I want is this charged taken off my credit card. I have a been a loyal customer for over 20 yrs. and have never had any issues until Thurs. Please look into this issue and rectify the wrong that was done by the Fox Rental company for not doing there job. Thank you