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Dear Yanisa,
Welcome to iTunes Store Customer Support. My name is Melvin.
I understand that you have been unable to change the country associated with your iTunes Store account, as you received an error stating you have store credit balance and you must spend your balance before changing the store. I know how important for you to get this issue looked into and I will provide you the necessary information.
Yanisa, I have reviewed your account and would like to inform you that our records indicate that you currently have 0.03 USD of store credit available. In order for you to change the country associated with your iTunes account, you will need to deplete your store credit completely by purchasing items in the iTunes Store. If you are unable to completely deplete your store credit balance because it gets to an amount that is less than the price of one song, you can give me permission to remove the remaining balance in your reply to this email. Please reply back with your permission to remove the remaining balance.