Purchase YA16793616 of 12 December, after two days...

Purchase YA16793616 of 12 December, after two days they send me email saying that the product is sold out, FALSE !! The product has been put back for sale at a higher price (28 more).
I demand that I be sent promptly since the delivery was scheduled AT MAXIMUM by December 17th!
Do not answer that you are verifying my order, there is little to check, you just have to send the item I purchased immediately as the same is clearly available on your site !!