Authorization Deposit held for weeks

I hired a car through Sani Car rental. An authorization deposit was placed on my account. I was then advised that the authorization was reversed with Standard Bank and I should give it 72 working hours to reflect. But Standard Bank didn't reverse the authorization. Two days ago they said 48 hours. Today they are telling me to wait another 48 hours but no one is providing an explanation of what is going on. Each time I ask, AuthsCancellation tells me they can only update the Merchant. Can someone please assist with this.