Double charged for rental car by Tempest Car hire and Vitality Travel

I am extremely frustrated, I booked a car for 3 days in Cape town through vitality travel. I was charged an amount of R974.25 by Vitality travel using discovery bank card. I went to collect the car at Tempest and my standard bank card was used for deposit. An invoice of R1299 was charged again by Tempest . I made a query and sent both invoices to vitality travel and tempest. Now instead of tempest giving me back my rental money for 3 days and only subtracting R200 of petrol from R1299 that was incorrectly billed I receive R324.This is an inconvenience from both parties with *********** people as this is a simple mathematics.