bad service

Sunday I went to the Glen to do my shopping as I'm preparing for my vacation. I find this skirt that I like and I it's written 169.00 on the price tag but as I by the till I give them R200 to pay instead I realise my change has somehow decreased I ask them how much is this and he says R199. 99 and I'm like it's says R169. 00 well I start getting attitude from this cashiers lady next to him and I say this is wrong and this is bad service and you also violating my consumer protection act and they gave me attitude until I left . I will never ever go to that shop again with their bad service and unprofessional act.