@home obviously advertise products they don't have

I went onto the @home website on Monday morning (12th May) and noticed a Nespresso Lattissima (***1) Coffee machine advertised for less 25%. I placed an order but was told on the last page of the order procedure that it was out of stock! Out of stock but it is advertised as a special between the 11th and the 15th! Does this mean they had ONE machine available at less than 25%, or not even one? I send an email to the address supp**** on the website to find out when this product would be available, but of course, didn't hear a word from them. Phoned this morning, and was told, it is out of stock. I know that, I want to know WHEN it will be in stock, and whether it will be available at less 25%, because that is what is advertised!