Greetings from iTunes Store Customer Support. My name is Monette and I’ll be your advisor who will assist you with all your iTunes Store concern. First of all, I would like to offer my sincere apology for the delay in responding. However, we make sure that all requests will be handled at the soonest possible time. Thanks for your patience.
I understand that you’re unable to change your country associated with your account because you still have a few left. I know you are eager to get this issue resolved at the earliest. I will do my best to resolve this concern for you.
Paruttakorn, I removed your store credit so you should now be able to change the country linked to your iTunes account.