Very unhappy with order date changed systematically and now I must incur additional funds to replace an order!

Order number ***

I placed an order yesterday for a delivery today the 05th, upon receiving confirmation the date was changed to the 6th, I called in to the call center and was told this is because there isn’t stock of what I ordered for delivery today, why did the website accept the order in the 1st place as the policy clearly says substitution of orders can happen, I require the flowers delivered today the 05th February and no one can assist me with a replacement or something of the same value as they say I need to re-order meaning I must now spend again for the delivery when the fault lies on netflorist side. I need this amended asap.