Nedbank loan payments

I asked Nedbank customer service to move the date of my loan debit order from the 26th of every month to the 30th. the monthly debit went through without any issues on the 30th November and again on the 30th of December. On the 6th January, I got a debit of R54.64 for "INTERNALLY AFFECTED". After my complaint, i got an email stating that my account was in default on the 5th January '23, today another 137.30 was debited with no explanation.