Bad service leading to extra charge on the customer account

I have purchased a top up contract phone with Telkom in Somerset Mall in Dec 2018. I got a good service and in around April 2019 I came back for another contract phone for my daughter. I got a great service from a well trained employee who put together both my purchases on a same account with a single debit order on the last working day of the month. Great so far but when I came back again for a 3rd phone, I was helped at the same Somerset mall branch, by an employee who does not seem to know what she was doing as she set it up as a new account with payment date on the 5th of the next month while I have asked her to consolidate them all on a single debit order like the previous phones I purchased. as result, one payment go through at the right time after my pay day while the other one go through my account on 5th to the earliest. when there is no enough to cover it, they charge extra R202 as penalty.

when I came to complain at the store and to ask them to run both the payments in the future on the same date, even the store manager does not want to help me.