Bank charges

on 26/02/2018 FNB deducted R110 for unpaid item in my account which was invisible to me, I could not trace the amount that was unpaid in this month of Feb. In March the same happened and was charged R110 on 11/04 and R330 on 12/04 and on top I have been charged R232.65 on 05/04 which description reads cash withdrawal adjustment fee. I urgently need clarification on this. I am completely unhappy with this bank and before I move my business I need a clarity. I went to the Waterfront branch on 24/04 and was promised to be contacted as soon hence they could not establish the fees. further I note that the bank fees are now deducted on 30th and no longer on 04 of every month. please explain to me these urgently.