Braaiplank - poor customer service.

Placed an order on 29th November. Order was paid for up front. I was informed that the item was on pre-order. Shipping was promised on 8th December. Received a email on 14th December stating that they did not have sufficient stock and 'possibly' item would be able to be shipped on 18th December. How can an order be accepted if it cannot be fulfilled as promised?