Clicks online shopping sucks!

I ordered a Hot Airbrush advertised on the their online shopping platform on 14 August. After waiting for 10 days I emailed them to ask when they would be delivering my purchase. I was told that:

The following item: "Salon One-Step Hairdryer & Volumiser (1), was unfortunately not in stock at the time of packing your order and we therefore need to refund you."

It begs the question as to why I was not given this information immediately? Did they think I would forget about my purchase and keep the money?