Nobody wants to miss out on a nice promotion. To solve this as quick as possible please check the following, as this usually solves the problem:
Delete cookies and cache of your browser. You can do this in the privacy and security settings of your browser. After deleting the cookies and cache please try to place the order again.
Use a different browser or different device to place the order.
In case neither of these actions solve the issue, please contact us before placing the order. Our customer support will help you the best they can to process the discount on your order.