rudeness and customer care don't go together

Higly appalled by the rudeness of the old lady at Postnet Beacon Bay in East London. She has absolutely no idea what customer service is and thus puts the Postnet name in a bad light. I was there this morning to print a couple of document and she just out of the blue starts shouting and yelling at me for no apparent reason. Please look into this as this is not the first time she has been rude to me and other BLACK paying customers who have been there. She is not doing us a favour. We pay to use those services.