According to what you said, when you buy goods in a regular shopping mall, the price marked on the goods is the selling price clearly indicated to the customers. According to the relevant price regulations, goods must be clearly marked, so that you can see the price displayed on the goods. In addition, the purchase price is the price that merchants buy from suppliers, which is generally lower than the retail price. Otherwise, where does the profit of the business come from? After reading your account, I think you may not have bought goods from a more formal brand or merchant, but since you agree to buy goods at an acceptable price, it is assumed that you have formed a contract with the merchant. If the goods are in good condition, you can negotiate with the merchant to return them.