HERTZ & CHANEL MASIGO ARE DISHONEST & *********! ****************!

I rented a vehicle with RA ***5 with Hertz. This specific contract ran from 24 Aug 2019 to 6 Sept 2019. The vehicle was only for use around Johannesburg. Three days into it on 27 Sept 2019 they called me saying they need to exchange the vehicle as they are selling the vehicle back to a dealership. I had no problem with it. I returned the vehicle on 6 September and a few days later received an invoice claiming I had done 1800km between 24-27 August. and I was charged R4600 as a result for going over the allocated free kms. I immediately flagged this with them and have been dealing with an ********* customer service agent called Chanel Masigo who has been nothing but dishonest. She sent me a response on October 3rd saying "Good Day, Thank you for your patience. Kindly note we are still investigating the matter we indeed still owe a credit to yourself we just need to finalise this with my manager". I never heard from her again until I followed up on October 7. She responded on October 9 saying that they have reviewed my rental agreement number and will be going ahead with what they charged me and the matter is final. ****************! How can a vehicle that was driven around Johannesburg only do 1800km in 3 days? That is the distance from Johannesburg to Cape Town, and then back another 400km. They refuse to send me proof of these kms from their supposed car track company. I want my money back and will not give up until Hertz pay my refund! DO NOT USE HERTZ RENT A CAR!!!!