Hifi corporation- deceive consumers

Absolutely ridiculous! I just recently tried to purchase a razer gaming chair from their online store during their special, payment done, waiting happily for the chair to arrive. It ended up with an email saying it’s out of stock and will refund me, but at the same time I’m seeing the ad still on their online store, and I’m still able to proceed to payment page!? I gave them a call asking for an answer to it, all they can tell me is that they are really sorry. And the most disgusting part is that up till today, I am still seeing the same item on their online store, just with the non-discounted price. This is a deceive of consumers!