Incorrect debit date

Our agreement was Nedbank will debit my account on the 26th of every month as i get paid on the 25th. Nedbank is too quick when it comes to taking my money from my account so they decided to deduct on the 24th so early in the morning. Now they took my money that was meant for something very urgent. I'm really not happy with this and its not happening for the first time. Why don't you deduct at a later stage than deducting before i get paid? I want my money back into my account ASAP and deduct on the correct date. If that date falls in a weekend there's still Monday or Tuesday where you can still debit my account. Whats up with the rush anyway???