Hello Sivaporn,
Hello. Arjun here again from the iTunes Store support.
I totally understand that you would like to cancel your purchase.
Yes, you are right. I’m pleased to let you know that I’ve already cancelled and refunded this purchase. Within ten business days, 1400.00 THB should be posted to the payment method used to make the purchase.
I hope everything goes well from here. Should you have other questions or concerns, please let me know.
Have a great day, Sivaporn!