Head over to www.rain.co.za  and sign in to my rain. Here you will see the order that you have placed. Hit the manage button on the order tile this will take you to the my orders page where you can cancel your order. 

If you require a refund for this order contact support from here and request a refund. When you submit your request for refund ticket, please provide the following information : 

• Last 4 digits of your card number that you used to pay your order
• Amount paid