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Dear Worapol,
Welcome iTunes Store Customer Support team. My name is Yogendra.
I see that you would like us to change the country associated with your iTunes Store account. I understand how eager you are to change the country in order to enjoy some new purchases. I will be working with you to get the country changed on your account.
Worapol, I reviewed your account and noticed that the store credit was already removed from the iTunes Store account “worapol9049@hotmail.co.th”. Please note that the funds that were removed won’t be refunded to you once you’ve switched countries.