How to make refund?

I pre bought the wow expansion “war with in” and now blizzard changed de suscription from argentinian pesos to USD. It is practicaly imposible to pay that montly 15 fee.
The normal salary in argentina is 300 USD… just if you change it is impossible to pay.
So how can I make a refund of the expansion?

You lost all argentina players blizz, we might no be a lot, but for sure this will impact you in one way or another.

This is the Latin American Spanish Tech Support forum. You may want to post your inquiry on the American Customer Support forums.