Unpaid Debit orders

<p>I got sms for low balance from Nedbank and immediately deposited funds for coming debit orders.on the same day 4 of my debit orders were unpaid despite enough funds in acc.i was also charged 4 x unpaid fees.i sent an email to Customer center to complain and request debit orders be paid and charges reversed....i havent had any response since December 2016</p>