Debit order date cannot be changed!

I get paid on the last day of every month. Sometimes the debit order of capitec goes off and there is no money in my account yet. So I have to pay the bank fees. I wanted to change my debit order date to the first of every month but apparently the debit order must go off on the day that I get paid. I think this is ridiculous. I am the customer and I must be able to decide the date of the debit order.so now I must pay the extra bank fees every month. Unacceptable!!!