UNPROFESSIONAL SERVICE & REFUSING CUSTOMERS CASH REFUNDS

I ordered two dresses on Spree and had paid for everything, then I received an email letting me know that they do not have one dress.. why do you allow that I can add the dress into the cart if you do not have stock on hand??! It is very unprofessional of the company to allow customers to buy stock items that they do not have. I specifically requested to get a cash refund for the item you couldn't deliver but that was mixed up too!I've allocated store credits instead of getting my cash refund. Yet another unprofessional act!!!