Bad Customer Service

We went to Shoprite Moruleng Mall with my sister on the 1st of November, we took less than 10 items n queed at Express till for about 20 minutes when we got to the cashier she said she cant help us because the express till is only reserved for "SASSA" people on the 1st, when we asked why isn't there any NOTICE then she said rudely said" cant you guys see no one is carrying a monki on this quee except you", I mean she was so rude and said we have to join other quees because there is no way that she will assist us and what Notice do we want because she is telling us (And she ddnt assist Us), my sister asked for a manager who to our surprise said the same thing that we were not supposed to be on that quee, we are just being difficult but serious a simple Notice on A4 paper would have spared us from wasting 30 minutes of our time on a quee for nothing eventually He asked one of the cashier to open a till and assist Us, who was also rude and said to another cashier "some people like special treatment ", what is worst is we went to Pick n Pay at the same Mall and there the was " Notice " on some tills that on the 1st of everymonth they only assist people who receive SASSS Grants.