poor service

I went to buy a few items at pnp and wanted to get cashback of R1500.00 when I got to the till point I was served by Primrose she scanned everything I gave her my card and asked for cashback, she said I don't have money. Go to other tills and I went to join another que and when I got to the front Siyabonga asked me are you drawing money I said yes, he said I don't have money go to other tills I told him I just came from another till he said there's nothing he can do and started serving the customer behind me. I have been to many retail shops including other pick n pay if a cashier does not have money in their tills they call supervisor to take the customer. To a till that has money or supervisor. Takes money from some other cashier and give the customer not keep sending me to all the ques and not caring if I am helped or not... I went away without getting any money .