Recall

I am beyond livid with standard bank yesterday I went to your standard bank branch in carlton centre to be assisted with a recall with a transaction of R20 000 that I had done in error to while I trying to pay a supplier at around 5:55 unfortunately I was not. Assisted as it was late and the branch was about close and I was so frustrated and needed the recall urgently the male consultant who was assisting me was asking me so many stupid questions and I could barely hear anything cause I had just lost R20 000 in error, to my surprise my account was blocked instead of being assisted with the recall of the transaction I had gone there for. What law give them the right to block my account? On what basis? That money is my last money, I haven't been receiving a salary for the past 2 months at work, we have been told to wait at home until the company calls us back when they are fanancial stable, for now I'm depending on selling Indian trandional clothes to Indian shops. I need that money to pay supplers and to make a living. If standard bank doesn't open my account I'm willing to take this matter to the Ombudsman and even further. Is this how are clients treated at standard bank? You guys just added to my frastrations instead of assisting me with a recall of the R20 000 I had just lost.