Advertise a Bosses Day product but cannot deliver it on Bosses Day!

Netflorist advertised a Bosses Day package and on their site showed ability to deliver the product on 16 October (Bosses Day). After I book and pay for the product, my confirmation email says it will be delivered 17 October. I queried this and asked that it be delivered as promised on 16 October. Their response was to apologise and advise the item is only available to be delivered on 17 October. How can you advertise a Bosses Day product (a simple hat box with common chocolates) but cannot deliver it on the actual occasion? This is false advertising and the fact you only advise after the purchase is disgusting. Order: ***