Terrible customer service front desk and worst system, response time.

Service in the front desk was terrible. Booked vehicle was not available, they had only one similar vehicle in option but the guy in desk, he says we can't give you this vehicle because of security reason. He was about to say we are not able to provide any vehicle but after mechanic check, we finally get a vehicle and we spent more than an hour. I asked off hour returned policy, he told we do not have dropbox but you can park in our parking lot and leave the key inside the vehicle and I asked twice just for make sure cause I have never done this thing, leave a key inside of the car, I guessed they have an extra key. Exactly I followed the instruction when I returned the car but they didnt close my account till a week later from car return day. I keep calling to all the possible location, customer service, manager, pick up location the guy who was sell to me, keep telling the story but nobody able to solve the situation right a way. they keep charging $100 per day on my CC. seller guy told me you left a key inside the car so we are not able to get key from inside so we have to call AAA and whatever the charges you would be responsible for that, which is totally unfair. I spent about 2 hours in a call every day after 5 days of return the vehicle. finally, I have seen they charge regular charges for one day but I am not quite happy with the overall system, service and response timing. I had a deal with so many rental company but never had this kind of worst situation, what about my compensation?