Non delivery after payment made

I placed an online order for 4 items as a gift to my cousin for her 50th birthday. Order was confirmed and payment made. On the day of my cousins birthday I called to track the order and was advised that the personalized item ordered was out of stock. I was horrified that ONLY when I called NetFlorist that I was advised of this. I cannot understand how the order was placed and paid for in full and then Netflorist has no stock. The only thing I was offered as compensation was a free delivery for my next order !!! I WILL NOT be using NetFlorist again!!!!