Europcar Pretoria - taking funds without my knowledge or authorisation, because of their error!

They take money from your account without your knowledge or approval! Then it takes days to figure out what it's for, no one knows why. Turns out being their error, capturing the kms wrong and invoicing incorrectly. It has been almost a week. I should have received a refund on the deposit already, but now I was invoiced incorrectly, they are taking their sweet time. It's just not being fixed and there is no sense of urgency. They reckon 7-14 working days. Absolutely unacceptable and ridiculous! I have to keep following up to find out what is going on.