Car Rental mixup -AVIS

On the 7 February 2022 I hire a vehicle from AVIS car hire - OR Tambo. A week later I received an invoice with the incorrect details, incorrect mileage and incorrect time of return. I was charge for 436km when I travelled just 50 km. The vehicle was returned before 1pm and I my flight left OR Tambo at 15:40. The invoice from AVIS shows that I returned the vehicle at 6pm ??? So I receive an invoice and have to pay an additional amount because somebody at AVIS didn't do their job properly. If my credit card was used on someone else's booking, how safe is it to swipe your card at AVIS.