We thrive on fulfilling every order with the utmost accuracy. However, At times a product may become unavailable due to increased demand. If a product is unavailable in your order, Our team here at Book Duniya will send you an email and text message with a possible substitution. If agreed, Please respond back by saying "yes" and we will fulfill your order. If we are unable to provide a substitution we will either refund you for that product or fill your account with credit for any future purchases.