Wrong Account billed

I changed my banking details from savings to cheque account. I called Standard Bank to update my details for the debit order and the lady I spoke to said its sorted. Yesterday they debit the wrong account and when I call the call centre today Amanda say I need to go and update my details at the branch because they do not have access to change it, two people from the same call centre give you different answers I don't understand. I have an unpaid debit order and a reversal who is going to pay for that. The same thing happened last year when I opened a cheque account which was blocked. There was money in the account but because it had a blocked status no one had access to the money, I paid for all the unpaid debit orders and reversal including the cheque card which charges my R100 for unpaid and they charged me the R98 for monthly service fee for an account which was not working, and it was from their side. Is this how Standard Bank makes their profit nowadays.