Still harassed even after payment received - and confirmed

every month I pay my car installment on the 25th this has been for the past 4 years and suddenly it becomes a late payment, probably a new boss trying to be super efficient but really irritating when you phone the call center get told the payment is received and not 5 min later get another call from the call center stating your account is in arrears. How useless are the captures in Nedbank?