Hertz and Rentalcars NO REFUND of monies duplicated

On the 27th of July I picked up a car which my husband booked for me in CT at CT International. He had booked the car via Rentalcars.com. On collecting the car, I was told to pay an additional amount of R17 000.00 deposit and I then queried this which turned out to be incorrect. We paid the collision damage waiver of R1800 to Rentalcars as well as the rental. Hertz then insisted we take out ANOTHER damage waiver with them directly and the guy said he would ensure that the Rentalcars waiver was cancelled. Well that never happened! And despite numerous calls and back and forth emails we are being shoved around with no one trying to sort this out - bottom line our rental cost us R2260.00 more than it should have!! NEVER again will I rent a car from Hertz - I expect this to be sorted out as they totally ignore the fact that we used Rentalcars as the convenient way to book a hire car! I will also warn any prospective Hertz and Rentalcar users on social media as this should not be difficult to clear up.