Not recommended choose any other car rental. NOT Sixt rental Car service very dissatisfied and disappointing

Good day just want to inform people that you should not use the renatl company at the airport named Sixt as they tell you on your booking that you will receive your holding deposit after rental and if you require it, then they say you need to wait 5 to 14 working days. But i need to put down the deposit emediatley very very bad service and very dissatisfied and disappointing. So ill advice from my side to rent any other rental service except Sixt. No one is replying to my emails.