*******ion in business sector

I have a credicard with them with a max of R 7500 i then deposited 31000 then used part of the money and came to say my account has been overdawn we calculated with the nedbank lady on our calc ulations it turned out that there is 5600 that is not accounted for, the lady promised me that her supervisor will call me and i never received any call from the superviserg only calls i am getting is aacount being overdrawn i womder when are they going to do teir calculations Nd update my account