Hi Nuttapon,
This is Jazzle again from iTunes Store Customer Support. Thank you for getting back to me promptly.
I see that you would like the purchases be cancelled. I know that you're looking forward on resolving this issue. Please allow me to check further.
Nuttapon, since the order has not been paid, I will be unable to issue a refund for the order. I will be happy to assist you further and investigate the possibility of cancelling/refunding the purchase once the order has been settled.
I trust the above information has helped. If you have any more issues or concerns, please feel free to email back. Have a good day.