Teller Lady with Bad Attitude aand staff complaining about being tired

I went to collect my lay-by, as i got to the till, the Lady greeted me i responded in English, and she started asking why am i responding in English, i told her that because im not Zulu and a she started telling me how i should be proud to use my language, the last time i checked i was there to collect not being interrogated, i was so ****ed, who is she to judge me, as i finished paying they told me to collect somewhere i approached one lady who works there and she said she was tired and she haven't eaten, and the other lady told me the same story, whos problem is it if they haven't eaten, finally got someone to assist me even though he was also complaining about being tired, after i left tried to call in to speak to the manager about the worst experience, the lady who answered the phone it was lady who assisted be while i was holding on the phone she kept complaining and swearing as cause she didn't want to answer the phone. why are you opening till late if you know your staff are not willing to work till late nad we as customer have to deal with the bad attitude, as for the lady she needs a serious customer service training and telephone antiques. i even log a co0mplaing and they said they will get back to me but no one called or gave me a reference.