Hertz failing to deliver the usual quality of service.

The worst possible rental experience after almost 10 years with Gold Awards. On the 4th after renting car with a colleague for 1 day ( 9 hrs and 12 min) i returned the car at 17h28 and it was inspected by an employee of Hertz who knows me well due to the regular commutes and was told that I can go and all is perfect. After checking the deduction made on my card i noticed that the amount was excessive. The invoice which I received indicated surprisingly to me a charge of over 5,500 due to damage and the return time indicated as 18h58. Needless to say this was impossible as first the car was returned long before the indicated time and secondly the flight was earlier than that return time noted. None of the invoices were signed by anyone. This is so very disappointing as it is the first negative experience. Hope that Hertz will look into this as a matter of urgency and rectify this error on their side. Regards