Worst customer service ever

Monday the 5th of October 2015 at about 2:30 3pm I came to shop at Woolworths in n1 city Goodwood, I was about to buy a pants the price on thee pants said R400 but wen I got to the till to pay the girl I dealt with said it was wrong price and said its R550 ... She said its probably a staff error and said she can't give the pants to me for that price and all she did was apologies !!! I explained to her that it's not my problem that the staff made an error and I would like to pay R400 like the price tag shows on the pants she said sorry and that's all I asked if that's the best they can do she said yes... I asked to speak to a manager but there was no manager at that time... I was also gonna open an account with Woolworths but was so disappointed and changed my mind.... This must be the worst customer service I ever experienced and I'm disgusted with Woolworths ...