Restricted account

Standard bank has blocked my account because they need to verify my source of funds. I am told to wait for 7 working days for that to be done. I understand that’s it’s a procedure but I called the company which my funds came from and requested a payment letter which was provided but when I call them back and request to send it to them as proof I’m told it’s not good enough! They sent a request to Nedbank to confirm the source so my account can only be unrestricted once Nedbank replies. No one understands that I urgently need money, I’m instead told that I can only put in a complaint after waiting the full 7 working days!