No Delivery, Order still in Progress

I placed an order online for a gas heater. It was in stock "7 AVAILABLE" at the time I placed the order. They said they'll deliver in 3 days. It's been two weeks, my order is still in progress. I called the contact center, the lady said she'd follow up with the warehouse. Guess what, they're out of stock and still waiting for the supplier to deliver due to high demand. Well that's not my problem that you have no sorted your distribution accordingly. A website should not allow a customer to buy an order online if it is not available for picking. I asked for a refund and I'm still waiting for a response.