Bad customer service

I went to boxer this morning at tshwane regional Mall and wanted to buy flavored water of thirst and they said I shud buy 6 per customer I made two different transactions so that each slip may have only six items on it so to my suprise the cashier that was assisting me by the name Nokuthula with attitude bust talking in her language talking to the security guy meanwhile serving me am not happy at all she proceeded to call her supervisor by the name of letsika or what I forgot they way I was so angry please do something about that store I love their promotions but not happy about the staff at all