Spar Westwood, pricing issue

I’ve always been so patient with Spar Westwood, Atlas Road. Everytime there’s specials they don’t update their pricing. So yesterday afternoon I bought items on special, to my surprise, when I got home and checked my slip, I was charged the original price/ some are few rands nore ☹️, this is not the first time this happens. E.g Omo washing powder 2kg on special (R89) but charged original price R109.. 7kg special price R49,99 but charged 52,99.. 2L Coke, 2 for R44, I bought 4 but charged R98 which is supposed to be R88; Tissue 18s special price R99 but charged 102,99.. what is this???☹️