Worst service from cashier to supervisor

I went to pick n pay in Mmabatho on the 30/11/2017 I was assisted buy Gasemorwa Mokae as my purchase went through I asked for cash back to an amount of R2500 lady said I don't have such an amount with attitude she did not even try to help.she then sent me to the supervisor Refilwe Modisadife to go ask for money from her ok I go to the lady she is fuming her response was she doesn't have till as I can see she is at the parcel counter were should she get the money?I then asked for management she then said management has nothing to with the money they don't have money how are they gonna help me?I should go to every cashier and ask if they has money,OK I did as I was told.I went to 1 cashier then went to withdraw the rest at Gasemorwa she then tilled my groceries I then asked for the balance she told me because she tilled my groceries she can't view the balance on my sassa card I told her to void the purchase and start over as she did not know her job I had to tell her what to do.I further went to look for management as I was infuriated with such bad service while am the customer and clearly at pick n pay customer don't come first.I laid my complaint &the manager called them as Gasemorwa left her till the other cashier asked her where she is going her response was I quote"ke bilediwa sassa"she shouted as she was proceeding to the manager.Pick n pay mmabatho should stop cash back as it's a problem it's the second incident,or change their stuff members as they are old and been there forever they clearly forgot the reason they are there.I am not happy with such treatment I got,I felt belittled,disrespected&humiliated.I am horrified by such service if the supervisor treats customer like that what should we expect from cashier or her juniors?