I want to reset my app store balance to 0 to change my country

Buy something more expensive than your balance and use a different payment method from the current region for the extra amount; if you can't, click here and ask the iTunes Store staff to zero it.

(247689)

You need to follow the instructions in the post above yours. Only Apple Support can zero the balance.

I want to zero the App Store balance and change the country

I want to reset my app store balance to 0 to change my country