Disgruntled business client

I have been a Nedbank client for just on 3 years now and am absolutely done with them now. Please explain to me how a bank can charge a small business owner (one employee) around R20 000 a year to hold ones own money. I have had a few come of this past month of R135 for excess fee when I have one debit in that account of R70 a month which is iTunes. No other debit has been authorized. When I went in earlier today not even the teller could explain to me what it was for. He then took down details and informed me that the small business manager will contact me today. No one has, I have registered imali twice and still cannot send moneys this way. Also I enquired about an overdraft and a small loan previously and both were denied. Please then explain why on earth I have a business account that cannot help me with my business and charges me a big business' fees????? If I cannot resolve this before the end of the week I will be moving banks.