Paid for order but then cancelled without warning, notification or replacement

To summarise: I purchased jeans from Zando on Friday. At the time of purchase, the jeans I ordered were available on their website. I proceeded to pay for the purchase. Later on in the day, I noticed that the order for the jeans I purchased had been cancelled. I was not notified of this until I prompted Zando. The blame was passed on to the supplier.

Also, no mention was made regarding a refund until I had queried this. When I had asked for a replacement (being only slightly different to the jeans I originally ordered) I was informed that this is not possible and that I would have to order online again . This means that I would have to pay nearly double the price for jeans that I didn't originally want and I would be required to pay postage again.

This is very disappointing, considering that a contract came into existence. I met my obligations for paying for jeans that were available at the time of purchase. However, Zando failed to meet their obligation in providing me with what I paid for.