Overcharge and ********* practice

Im rewritting the story in a hopefully more clear way: First let me say I'm Europe so kindly forgive my English. I'm a long term car renter with Hertz Car Rental My rental was extended monthly (via call or email). I have always pay the rental on-time. The problem 1) During my rental, Hertz has over charge me for various reasons (change of rental price without prior notifications, overdue between two contracts extensions, etc). The balance in my favor is today of around R10'500 Note: This number has been provided to me by the Hertz accounting department, after having try without success getting these information from the branch manager (Lindi, Hertz Sandton - Hilton) and the regional manager (Wayne): My first request to clarify the amounts there were taking from my credit card was submitted in October 2017, and I got the final balance early Jan 2018, after multiple calls, visits, email and escalation. 2) I asked them to pay me back the the amount over paid (less the deposit for the current rental), which they refused, saying it will be pay back to me when the contract will be closed. But that's not my main problem. 3) In December, I have been asked if I wanted to extend until end of January which I agreed. 4) Today around 11am they called me to say if I wanted to extend again, which I rep**** yes. 5) They then told me the transaction with my credit card failed. I rep**** I will go to the ATM after work today to load my credit card (I can't do it online, my CC and my check account being from 2 differents banks). They refused and wanted an immediate payment. I asked them to take it either from the balance I have over paid or try again later today. They refused again and sent immediately the risk management team. I went to the car, they took the key. 6) I asked then to the branch manager to open a new contract for me starting from tomorrow, as I will load my credit card around 4 today. They rep**** as follow: "Unfortunately not, because our risk department had to collect the vehicle you will not be able to rent from us again.| Also note there is R3274.52 outstanding on the rental, this amount is for recovery fee, overdue fee, valet and fuel." I found this practice disrespectful and unfair, as I asked to wait for 3-4h for me to load the credit card being at work. Not only they refused, despite having rent for long time with them, and despite they have a balance in my favor of R10'500, but I'm now black listed with a R3'274.52 to pay. They haven't been able to wait 4h the same day for me to knock of and to to Sandton city in order to do the deposit. In more, once established early January 2018 by Hertz accounting department that I have a balance in my favor, the refused to refund it to me. During the time I rented with them, there was also many different problem. For example, I booked from an oline website and paid the full month of this rental online. Then when I went to the branch to collect the vehicle, they asked me my credit card to charge me the insurance. As I was having at this time another credit card than the one I was using for my booking, they told me they will have to charge again the rental (R4'200) I already paid online + the insurance, and that the amount already paid online will be reverted to me. This amount did never came back, and when I asked them to refund it to me (as they have receive the payment), they told me to ask the booking site. How is that possible they ask me that ? They also changed the rental price unilaterally, without informing me: they called me, asking me if I want to extend my rental for a month. I said yes, then I received a SMS from my bank showing an amount taken by Hertz 30% higher than the previous rate, without telling me anything Finally, the time to get a response from them regarding the over payment was 3 months. They barely assisted me until I escalated to the regional manager, who was not very involved. For all these reasons, I wouldn't recommend to anyone to rent with Hertz. To my experience they have extremely bad commercial practices, don't have a problem to over charge you, decide when they will refund you and rush (same day in a 2h window) to tow your car unable to wait 3-4h for the payment to go through. In more, they will invoice R3'200 for having take the car and black listed me. I believe my feedback IS accurate and conform to the reality.