Tempest Car Hire King Shaka deducting your credit card

I rented a car from Tempest Car Hire King Shaka earlier this week, before returning it I filled up at the Sasol 300 meters from the drop off point. A few days later I was charged for re-fueling.

Do not support them, since they have your credit card details and the deposit, they can deduct whatever they feel like and invoice you when they feel like it.