Nedbank incompetency

I have been banking with Nedbank for the last 10 years, I have a debit order issue currently that I have been trying to sort out for over a week now.

I want to stop this debit order and reverse the last one of 01/01/2020 when I go to my nearest branch they are unable to assist, when I phone customer care the refer me to contact the company.

I want my bank to assist me is stopping this debit order as the company has closed down but money is still being deducted from my account.