Watsons Sold Me Non-Existent Products, I Want No Cancelations but the Products

Yesterday, I purchased the Flormar French set during a one-day special discount. The product was out of stock on their website, so I inquired about the stock in the Osmaniye store, and it showed the last two units were available. I placed an order, and despite the confirmation, when I called the store today, they informed me that the product is not in stock, and my order will be canceled. I do not want my order to be canceled; I want to purchase the product at the discounted price. If it's out of stock, they should have updated their website and refrained from making sales. I strongly insist on not canceling my order.