Dispatch dates changed because of no stock

I ordered a number of items on the 2nd of November all of the items claimed to be 3-7 days delivery. After checkout, this changed to 21 Days delivery. I sent them an email querying why there was a delay suddenly and got the following response: "We confirm that your order should be dispatched on schedule. The latest expected dispatch date of your order is 21 November 2017." , which did not actually answer my question. I then phoned them and asked what was going on. I spoke to Danon, who said that there was no stock of any of the items ordered and that expected delivery was in 21 days. I asked if there was any of the ordered items available and was told that not one of them was in stock. On going back to the items on their website every item dispatch date had changed. One item is now out of stock, one is 3-7 days delivery, and one is 21 days delivery. Well, if they are ALL out of stock, then why has the page not been updated for ALL of them to be out of stock. Now, someone else will fall into the same trap; PAY for the item and only then find out it is out of stock and have to wait 21 days. Of course I can cancel the order and ask for my money back, but I have now already lost a few days on trying to solve this problem. It is very frustrating. This is NOT the ethical way to do business.