Misleading Customers and Bad Stock practices

Yesterday I ordered 2 industrial ceiling fans online. It showed 4 items in stock at Faerie Glen. I proceeded to pay for it and it showed that it was ready for collection yesterday.

Today, I get a phone call that these 4 ceiling fans in stock, were "Reserved" for another client. And I can't have the 2 that I've already paid for.

After 3 phone calls, wasting another full day, I'm now told that I must apparently now first TELL them to order stock. Else they won't. If they didn't have stock, they should've ordered it YESTERDAY morning when I placed my order. Better yet, on their system (assuming a large company like their's would have some kind of ERP system) they should have entered a Reservation on the stock, which would not keep the item then as available online. In fact it's STILL showing the balance (2) as available