Amazon.co.uk - Item dispatched, but email from seller saying, actually it hasnt

I'm not a regular user of Amazon.com/.co.uk but, I do buy the odd book etc here and there during the year.

I purchased an academic book from a seller based in Spain, who seems big and to get good reviews.

The order went through as normal, and I received a dispatch notice from Amazon.co.uk

Then, this morning I received an email from the seller saying that despite the dispatch notice, the item could not be shipped as the stock was damaged and that they are reordering it from their supplier and this may take some time.

While it could simply be an administrative error, I was wondering if it's worth filing a dispute with Amazon at this stage and seeing if I can cancel the order?

I was kind of relying on the book arriving quite promptly as I need it for an academic programme.

I've replied to the seller and asked for a revised delivery date.

Any ideas / suggestions?