I need my account unfrozen as soon as possible!!!!

I’m so frustrated and I can’t believe such big bank like FNB can treat people like these, I have business account with you guys and my account is frozen due to transfer of R19k from the client and now I’m told that that account is on investigation. How the hell is that my issue now and useless bank with poor customer service at Kempton square they have nerves to tell me that I must wait 10 working days!!!!!! How? It’s Xmas time I’m running business and I have orders to do, people to pay… I need this sorting out ASAP