No answer at all after 2 days of trying

I'm trying to resolve an issue on my Standard Bank account and there is no answer every time or the call drops automatically? The one time I got through, to the person transferred me and the call then dropped. I've been trying for 2 days now.

The debit date on my account was automatically changed without my knowledge, from the 10th to the 2nd. This resulted in a the debit returning unpaid and extra charges. There were funds in my account on the 10th to pay the debit order.