DISAPPOINTED CUSTOMER!!!

I bought stuff last week online. The same day I received an email stating my order is been shipped.Today, 5 days later I received an email stating that one of my clothing is out of stock.Which order where you shipping last week? On top of that, the email stated I need to inform them once I receive my order so they can refund me for the "out of stock item".Why should I inform you? Refund me for that item now since its not included on the shipment.I WANT MY MONEY NOW!!!