NEDBANK - REPORT THEM THEY DEDUCT ILLIGALLY OF YOUR BANK

Good day, this is the 5th time Nedbank has triple deducted! YES TRIPLE DEDUCTED off my account. i have begged then so many times, i have emailed, i have called, so many times, no answer, i have given no instruction or permission for this amount to be deducted off my personal accounts. what can be done about this? it cant keep happening.