Don't have the stock after accepting the order

We placed our first order by phone, with this company for a childs table & chairs. We were told the item would be delivered in 3 days & were given a reference number for our order. After a week of waiting we contacted them again to be told they were out of stock & would not be having any more. So why did they take & confirm the order in the first place. Watching my bank statement for an unauthorised charge though. Will not be using again.