Being over charged

I have a student account with FNB. On the first there was a debit order which was supposed to go through but I didn't have enough money on my account so it rejected. Then I was charged R110 "#Item Paid no1 items on", then R100 "#Item Unpaid no Funds", and then again R330 "#Item Paid no3 items on". The total of the penalty I was charged just for one debit order which didn't go through is R540. I spoke to Lebogang on Monday and was promised that I will be contacted on this but so far nothing and the charges are still the same. Please help I know I was supposed to be charged R110 penalty not the rest..