Debting me earlier than they should and not taking accountability

So I called finchoice in may month to change my debt order date for June.

June comes they still debt me on the same date after calling a month in advance to change to date, I end up paying R500 worth of bounce fees because they didn't do their jobs properly.

I call in and email regarding my issue I am then told by WENDY and have proof on email my debt date has been changed for July month.

July comes they debt me once again on the wrong date after informing me in writing and over call that my date has been changed.

When finding out once again why this has happened I am told the following your account is tracked 5 days in advance before your pay day hence we debt early.

But mind you I was not even paid lol I am no longer employed hence I changed my debt date to when I will have money.

Now I'm left with paying additional bounce fees they don't care about.

So they keep debting me early leaving me with bounce fees they say they not accounted for but I have in writing they changed my debt date.

Two months in a row I have to fight for something that is so simply yet so hard for them to do.