Dishonesty

I'm very disappointed at the pharmacist that was helping me today at clicks sharons place Lerato Seloma she failed to be honest with me as a customer. I was looking for something and I noticed that it come with 2 different prices R169/R159and I ask the lady what was the difference she then said one is pills and the other is sachets then I opted for sachets R159.I then proceeded to make payment to my surprise it scanned R169 I then said No R169 was the one for pills this is R159,cashier and I went back to dispensary shocking the lady had already removed the R159 tag.I ask her why u did not say that it has changed unlike leaving me to be confused and looking like a fool at the till point.Did the lady not try to justify her actions, arguing with me firstly she wanted to deny acting smart .These are one the reasons why ppl always fight and act inappropriately with cashier or rather ppl behind the counter,she should have told me that "my sister unfortunately the price has changed" Not to act all smart and remove the price once I left.