Deduction on the incorrect date

I received an sms confirming date of deduction of loan to be the 15th. I responded to say the 25th December. I made a courtesy call on the 14th and was advised by a customer service consultant by the name of Again that all was in order and there will be no deduction on the 15th. He even furnished me with a reference number. And guess what the deduction went off my account on the 15th. Been on the phone with Samuel Makwela for the last 1 hour...with no luck except for hold on for my Manger for 30 minutes...the level of incompetence is beyond words...please don't ever use Ned bank. They are the most useless bank ever... still holding for Oduetse and Zaid.