Our order has not been delivered because one of th...

Our order has not been delivered because one of the items on the has run out of stock. Fortnum's refuse to cancel the 1 missing item and send the rest, but told me "it's ok, you can cancel the whole order". Either way, we now have no Chrismas lunch and no treats for two very disappointed three year olds.
You've made me take the day off work to go hunt through half-empty supermarkets so I don't disappoint my family.
Simply the shabbiest excuse for customer service I've ever encountered.