Hertz Rent A Car

So I rented a car here last Friday ⁸⁄₇ and was supposed to return it Monday ⁸⁄₁₀. I was scheduled to pick my car up at 8am on Friday morning. I arrived 5 min early so that I could get a head start (location states that it opens at 8am) on a long drive to Alabama. Well, the agent strolls in 40 minutes late (he does give me $ 10 off my rental) then the computer takes 10 minutes to boot up so I didn’t get on the road until after 9am (which was frustrating in itself). As I drive off down I-​77 the car starts to shake and I can barely keep it on the road. So back I go to Hertz only to find the agent gone. 25 minutes later he returns (now close to 10:00am with a line of other people waiting for him). He gives me another car and I am on my way (2hrs behind schedule). Come Sunday, I end up leaving Birmingham early and I return my car a day early. I follow all instructions for the off hours night drop and I am on my way. It’s now Wednesday (almost 4 days after I return my rental) and I am getting calls from Hertz recovery center threatening legal action if I don’t return my car. I have been on the phone all morning trying to prove to them that not only did I return the car but I did so ahead of schedule. Turns out agent never closed out my transaction. Not sure if he is a new employee or what. Come on! Get it together!!! Never again Hertz (at this location at least).