Debit order SMS

Debit order SMS on the 23/08/2019 when I am getting paid on the 25/08/2019 and I made a cash payment on the 22/08/2019 of R4000.00. How does your system assume that if my payment date falls on a Sunday then automatically I will get paid on the 23/08/2019. A sales person at the store told me that if my debit order falls on a Sunday then the debit will go through the next day. I contacted Customer care line but I was placed on hold for more than 10 minutes to get through to the debit order department.