I will be in Switzerland for 2 days, and I have purchased Saver Day Passes for both days. However, during the payment process, I selected the ‘Half Fare Card’ option because it showed a lower price. After completing the payment, I realized that the Half Fare Card is a separate discount card that I do not actually have. What will happen if I use the Saver Day Pass without owning a valid Half Fare Card? Is there any way for me to change or upgrade my ticket?