customer service

hi id like to place a complaint about a cashier at the vosloorus boxer, i dont get how you people sell freaken plastics at your till points and then expects your customers to fetch them themselves when youve run out, sending me back and forth for something you shpuld have is a serious inconvinience, she refused to sell me a plastic and wven the the people she asked gave me freaken attidude, id personally like to know what you do with such bad service