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Hi Chanunchida,
Thank you for writing back! This is Johnson again from iTunes Store Customer Support.
Chanunchida, I am sorry for the delay in getting back to you. It was my weekly off days in between that caused the delay. I appreciate your time and efforts for replying and thank you for you patience. I would like to be of help for you and support you with this issue. Hence, I made a detailed investigation with the provided account name and we are unable to locate an amount of 546.85 USD on the date 14 /12/2015. I request you to review your purchase history and provide us the exact order number. Once you reply, I will be able to investigate further and help you in resolving this issue at the earliest.
See your purchase history in the iTunes Store on a Mac or PC:
https://support.apple.com/en-in/HT204088
I look forward to your reply and I will be more than happy to help you.