Dischem not honorable

On December 15th Dischem had a sale on their perfume for 75% off. Immediately after I got a message stating that my order is being processed by their Parow branch. Today I get a call stating that Dischem is unable to honor the purchase as they do not have stock 5 days later I get noted that no stock is available for a purchase I made and paid for immediately that unfortunately a refund will need to be processed. No where on their website does it state they will not honor if out of stock. I am extremely disappointed in Dischems service..