Utter bad service from PnP cashier

I went into the PnP promenade store at just little after 9pm the evening store was completely full and busy, all tills, speed checkouts, all with long queues, I noticed few patrons paying at the cigarette counter, whereby their was 2 smaller queues and people paying over their, I proceeded to move to the one cashier named Pamela which after standing for almost 10 mins whist she served person's in front of me, the second I got to the till point with my 1 item, immediately she said she won't help I must move again right back to other line, after me having already standing for 10 mins, other patrons came from behind me, she shouved my item right out of the way and continued to helped the customers who pushed right in front of me, as she then communicated with the African cst's in their language that could unfortunately not fully understand, whilst I was standing now again for almost 5 mins, whilst all of this was happening, I asked her to call the manager, she just rudely ignored me and continued to help other cst's, I then proceeded to the information desk, hoping to be assisted,stood there for 10 mins when at till point, cashier said sorry, I cant pay here,after 10 mins then helped