Poor Customer Service

I have recently joined Nedbank (opened an account) and I took a loan with them as well. From the first month they were supposed to deduct the installment, the consultant might have captured the debit order date incorrectly, but I called them to change the date (to the 27th of every month) and the consultant I spoke to last week informed me that it was sorted. A few days after 14/04/2018, I get an SMS saying that they have deducted the loan amount of R1482.89 from my account. These SMSs are being sent to me every few days, whereas the normal day-to-day notification SMSs are almost always late, and this is making me scared to continue banking with them as I am under constant fear that Nedbank can do whatever they want with my money, without even consulting me. I want these SMSs to stop and for them to deduct the loan amount on the day provided and only send me notification then whether you got the money or not. If any amount was taken from my account an immediate refund must be done. This kind of service is unacceptable, espacially for a new customer. if this is not sorted out I will be moving my money to another bank.