Rental Deposit sill on hold

I rented a car from 1 to 13 April 2023 at Cape town Airport. The vehicle was returned and they acknowledge that everything was in order. I received my invoice and today 8 days later I am still battling to get my deposit back from them. I've been on the phone whole week and everything they just say that it was send to their back to cancel the transaction. Problem is that there is still a hold on the money in my bank account. I am up in arms and don't know what to do anymore. Seems that they don't know how to do their own business