It’s likely an IT error. They had a different code advertised for the 66% discount. Did you contact the company? It’s highly likely they would have given you the 66% discount if asked. The 66% code is/was BEST(something.) The “Regular” price of the Premium Pillow is 69.00. If you use the promo code B21 the price at checkout is 29.00. Might want to check customer service for more information.