Purposefull early debit, guaranteed rejection charges

They attempted to debit my account on 24/09/18, a day before I get paid. Their explanation is that they don't debit on weekends (something which I have no control over) then bill me for debit orderrejection charges, R202.70 to be exact, not to mention the charges on my bank account. So now they refuse to refund me. Great business model for thievery, imagine just 5 clients this weekend, that's over R1000 just taken because they can.