Ordered a Dyson V8 Absolute on offer at 299, paid ...

Ordered a Dyson V8 Absolute on offer at 299, paid and everything ok. Availability was in green. The following day I receive an order cancellation email because the products on offer were finished, but when I paid for it, there was ... so? The order number is YA19345868. It is unprofessional on your part, if a product has ended at that price it must be removed, or you take responsibility. However, the refund was quick.