FNB poor customer service

I am writing on behalf of my husband who owns a car dealership,on the 14 of February 2022,he sold a BMW X5 to a walk in client R157600,00,After he received his payment in his fnb private client account he released the car and the Natis to the client,surprisingly after 3 hours his account was put on hold.since from that day up to this day ,he is calling and sending emails to the investigator by the name Nhlamulo Baloyi but she is not even responding and his ref is ***.It’s almost a month now our account is still on hold, the investigator doesn’t even call back ,he sent all supporting documents to show that he sold the car but still we are getting zero assistance,he even called the manager and we were given 48hrs turnaround time but it’s been 3weeks now.What is the point of opening a private client account if their service is very poor like this.l don’t recommend anyone opening a private client account with FNB because of their service.We want FNB to remove the hold on the account asap because this is inconveniencing our business.