False advertising!

My mom and I went to PnP Hyper Princess Crossing yesterday for groceries and we were so excited about all the smart shopper specials. To our dismay our groceries amounted to just over R7000. So we started checking when we got home and everything we thought we bought at sale price was charged at normal prices, I can count the Alva gas cans which were supposed to be R100 for 4 but the slip shows we paid R34 for each. Olive oil was supposed to be R100, paid almost R160, a small veggie combo which was supposed to be R50 was individually charged at normal price. Additional to this there's even more items. So much false advertising PnP???? I demand that this be looked into and I demand to be paid back my money!!!