Incorrect price and bad attitude

I went to Toys R Us, Mall@Reds on 14 July to get my son's birthday gifts. I selected my items and took a Spiderman which was marked down from R299.90 to R249.90. When I got to the pay point the guy immediately told me that the black and red Spiderman is on sale. I advised him that the tag states Titan Hero, Was R299.90, Now R249.90. He called his manager (Assistant Manager - Elizabeth). She advised that they marked it for the black and red Spiderman and not for the blue and red one. I showed her the tag and remaining items on the shelf. There was only 1 black and red one and the rest was blue and red, all stacked behind one another above the label. She refused to give it to me at the price they presented. This was very bad service. I was not fussy about the R50, just her entire attitude. This is however not my first bad experience at this store. I also buy my yearly company Christmas gifts from them. I refuse to do it this year as I spend more than R30,000 and could get the same somewhere else. You lost a very good customer!!