Nedbank is one stressful bank

An incorrect amount was debited from my account and I sent a reversal form online but 3 days later, the funds haven't been reversed and debit orders are bouncing off.. now my account is on a minus and Nedbank couldn't care less, yet I have debit orders not paid.

Next thing you know, amount will go back into my account and find this minus, then there won't be enough for my debit orders all because nedbank is slow with it's service and this minus has already taken the small amount I had.

Already know that all I will get are excuses and no concrete resolution to this.