Why on Earth would they bin off my whole order and not suggest they move it by 30 mins if they have to??
My guess (stress it's a guess) is that there's an issue at the warehouse, and you live somewhere which can be covered by another hub, and they've made its slots available to you. So new order needed as it's being done elsewhere.
We've had tech issues here that meant I was told one order would be an hour late (was only 30mins late) and lots of missing items. Including some expensive wine meant as a present - and since then they've been adding it to my 'have you forgotten?' list. No I haven't forgotten that I had to cone up with an alternative present because you couldn't deliver something two weeks running!!
Best one recently was thus weeks order - I'd been offered a free gift (6 pack of cans of soft drink of a type I don't buy). The flavour was out of stock, so they subbed a different flavour from same range, SI far so good. On the receipt 'matching discount applied' and a new price of £3.19! Since when do you bill customers for a free gift !?!?!?!