Can I receive tax refunds if I am not a U.S. citizen, I don't live in the US, but work as a salesman for an American company that pays me commissions?

I am an authorized distributor of the company, and I sell (online) the products of the company and get commissions for it. I write the invoice for my commissions (and pay 30% Tax), and the company then pays my commissions (without the 30% of taxes) by transferring to my bank account in South America.