Holding Deposit / Reserved Amount

It is regrettable that I have to resort to a public forum. Previously the service was fine from this branch but an old problem with Avis has cropped up. When one rents a vehicle from Avis, a holding deposit is reserved on your Visa/Mastercard. When the invoice is created for the rental, Avis is supposed to deduct the invoice amount and release the balance of the holding deposit. It has worked this way at the King Shaka International Airport branch throughout 2017...until now. I rented a vehicle from 22 October until 24 October. On 30 October an amount of R1 370.65 was debited from my account without the holding deposit being released. On Thursday 2 November I was promised in an email that they have requested the release of the holding deposit and it will reflect in my account within 2 business days. It is now 10 November and I'm not getting a response at all. This is ******** behaviour.