Standard Bank premature debit order

I am a Standard bank client and have multiple accounts and loans with them.

On 13.12.2018 I was sent to following sms: Standard Bank: Hi ? for your convenience, your Personal Loan debit order will be processed on the 14 Dec’18 to give you time to enjoy your NEXT family holiday. The Jan’19 instalment will be processed on the normal date. Queries? ***.

So I was given a few hours’ notice that they will be running the debit orders which was agreed upon and has always ran on 25th day of each month.

I called ***to cancel as I am not able to honour it at this point in time, I spoke to Tsepang Mgoza(Line Manager) and was told that the debit order can’t be stopped and will lodge a complaint on my behalf voicing my displeasure. I have also requested a call back from his superior which has also not happened. They are also refusing to refund my money for the call as I had spent 15 mins on a called that was to no fault of mine.