Management and System Problems at Hertz

I rented a vehicle from Hertz Herm**** on 25/03/2024 and returned it on 26/03/2024. A deposit (block on my bank account) of R15 000.00) was implemented. Today 21/04/2024 that block is still on my bank account! This after I phoned and sent an email on 16/04/2024 and was promised by Ricardo Jasson of Hertz that he would sort it out. I again sent further emails without reply. On 19/04/2024 I tried phoning their customer relations department without the telephone being answered! I tried repeatedly and got the direct number for customer relations as well as the head of the departments name Sasha Adams and tried again without success! I then spoke to Hertz Herm**** who gave me Sasha Adams email address. I then received a reply stating that they would instruct the bank to remove the block, but nothing has happened thus far!! It is clear that Hertz has serious management and system problem so keep away.