Hertz do whatever they want

We noticed unauthorised charges on our account and went to Hertz to query this. They presented us with an invoice/contract showing a rate of R342 per day. Told them that wasn't the rate agreed to. After much back and forth they pulled the scanned copy from their system...the one we had actually signed and this showed the correct rate of R234 per day. Who at Hertz is making these fictitious contracts and then helping themselves to money out of our account to pay for them? Still trying to find out why they debited R10300 out of our account on the 17th Feb. Our local branch was no help at all and said Hertz don't accept Capitec (we have been renting from Hertz using Capitec for over 4 years). We were also told that the money taken was to reinstate our deposit as they had app**** the deposit towards the daily rate when they were unsuccessful in debiting the account (unsuccessful because they were overcharging without us being aware). On who's authorisation did they apply the deposit because they certainly didn't contact us and in the event of an accident and having no deposit, who would be responsible. We have now been informed that the overcharges and debits are now our problem to sort out. So Hello Hertz, lets sort this out