False adverti*****t, if I understood it I wouldn't have bought those lamb chops

Woolworths Sammy marks is luring customers to buy, I bought lamb chops and outside the package there was stickers showing R199 and there was another one showing save R15, so I bought it because it is on sale, I didn't check my till slip, so when I get to home I see that they tilled the original price but if I didn't see those stickers I wouldn't have bought it to be honest, worst part I asked the cashier when I was paying they said it will deduct. So I went back to the store today and asked, then the security said is part of marketing and most of the people don't understand the sale they advertised, I feel ****** because I wouldn't have bought the lamb chops if it wasn't for those sale stickers, I feel like they do this to attract people to buy then you don't get the benefit of the sale but yet the product you got is on sale (save R15 & R199) and the security and woolworths employee tells me it's part of marketing, I even have the picture of the package