Nedbank unproven claim to has not receive suffient fund in my bank account

I have a personal loan with Nedbank, the monthly instalments were debited on the 26th of every month without a problem. Until last month whereby it was never deducted as per agreement, no communication whatsoever was made. I then receive an SMS on July 31 that says my credit life policy will be cancelled or affected negatively due to non-payment. What frustrates the most is that there was sufficient funds in my account but Nedbank never deducted what's due to them before and even after the debit order date.

I called the customer centre and the consultant told me that she has no clue why the instalment was not debited and the system is showing her that it is still tracking funds, no assistance or solution came out of that call and I felt useless as she was becoming impatient with me. soon after I hang up, I received an notification from my bank the Nedbank has cancelled their DebiCheck or order.

can someone who has knowledge and answers resolve this as it will affect my credit profile. I am not happy with the poor service received. If this is a trick to avoid paying out credit insurance to customer when required to, then I sense ********* business practice.