Inconvenienced at Pick 'n Pay Willows

I had a terrible experience, I was sent an email regarding things that I normally buy so there's a certain amount that will be deducted when I purchase the same products. So before I buy, I spoke to a lady by the name of Amanda Hlongwane, I showed her the email and asked her how will the discounts be deducted before I shop. She said I must go to the self service machine, swipe my card and see if they do reflect. I went and I told her that they do reflect so is there anything I need to do before I buy and she said no, they will deduct automatically after they scan my card. I spend 30 minutes with the cashier that was assisting because I had to load them first. I got frustrated because I asked before buying because I didn't want any confusion when I got to the till. I ended up paying the whole amount because I was tired of waiting. She could have just asked the next person if she didn't know how it works.