Hertz holding deposit for over a month, depsite two promises to return earlier

Rented a car from Hertz, Returned fine without any issue on the 10th December, was promised R15 000 deposit returned within two weeks. Its now 1 month and still nothing. After making a complaint on Monday 5th, Naasief Abrahams at the head office promised return of funds within 48-72 hours on Monday 5th. It is now well over 72 hours without anything in my account. This is terrible service, Outright lying and holding back of funds way beyond what is acceptable. I will never hire a care from Hertz again due to this, I am now paying interest on the funds held in my credit card. WHAT A SHAM!!!