WW poor staff and service

WW has this special on Everyday pasta where u get 3 packets x500g pasta for R55.00 each being discounted to 18.33 instead of the normal price-22.99. I used the app and my items come from the Cresta store in Randburg, and i chose, Penne, Fusilli and linguine, Fusilli was out of stock and they replaced it with another Penne which is also on special but i was charged 22.99 and not the discounted price of 18.33. Bear in mind both Penne pasta have the same product code yet was charged at different prices which doesnt make sense. The staff are just as stupid as they dont double check the prices when scanning the items. What calibre of people are employed these days by WW when customer service was such a big thing a few years ago?