Incorrect pricing and being treated like a fool

On the shelve the high tumbler was priced R3.99 so when I got to the paypoint it scanned R5.99 so I told the cashier who called the supervisor who just said it's incorrect pricing. I insisted that I pay for what i saw. I asked them to correct it but the blatantly refused and offered me a sarcastic apology then laughed... unfortunately I worked for pick n pay and I worked as supervisor I know scan right policy in and out. I paid the money and walked out after I was treated with that condescending manner. They told me if I want free things I must contact Head office as they are a franchise <br>