Refund after delivery date was changed.

Yesterday I orderd a product which I need by the weekend. Delivery was scheduled for today 22 September.. Just now I was informed that delivery has been recheduled to 4 October. I have requested for a refund to go and shop somewhere else. I have been informed that a refund is not possible. I feel this is not my mistake. If I knew from the start when I have ordered and payed for the product that I would wait 10 days for delivery I would not have ordered the product. Not my mistake I need a refund so that I can go and shop somewhere else.