Charging for Services Not Used

Hired a vehicle through them at King Shaka Airport and returned it at King Shaka as well after 4 days having only done 263 kilometres of travel around Durban. A few days later I get an invoice from Woodford for nearly R460 for tolls between Pretoria and Polokwane {Pietersburg} in Limpopo Province basically between 650 and 1000 kilometres each way from Durban after many emails and a few phone calls with promises to return calls and rectify ,no rectification or returned calls. In other words all promises ,NO ACTION !!!!!!