Poor customer service

Yesterday I went to Shoprite Watergate Mitchell’s Plain looking to stock up on the Huggies dry comfort diapers that are on special until the 21st of May as per the pamphlet. When I got to the store they had no promotional diapers available claiming their store does not have the special, no available stock either and we are looking at the wrong pamphlet. The cashier I was speaking too was extremely rude saying that we should just buy it because it's not expensive, at the end of the day no cashier should tell the consumer anything and I don't if I have a million rand , I want it for the advertised price and that cashier needs to shut the hell up and stick to her crusty job.