Standard Bank Business Banking

I had a very bad experience with Standard Business Banking, at the end of last month standard bank apparently had a system error where they were not "correctly" charging bank charges, so month end they decided to correct the "error" and debited bank charges for the whole year and in my case that amounted to almost R5000 of charges that were deducted from my account without warning, no sms, no phone calls from the bank alerting me that this will be taking place

I tried going to the bank but i got no Joy because I have been waiting for my business banker to call me back, its now been 2 weeks! I don't think its fair to just deduct that kind of money from peoples accounts without notification especially because it was an error on their side

I would like that amount reversed back into my account and then we can talk about a payment plan for the 7 months of charges that they erroneously forgot to debit.