No Stock

I ordered a couple of items online last week and receive an email today that they don't have stock and will refund me. Why do you let people shop on line and waste their time and effort when you don't have stock. UPDATE YOUR WEBSITE SO THAT WHEN THERE IS NO STOCK IT WILL SAY SO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! And this is not the 1st time this has happened and when I emailed the person back they did not respond so here I am complaining on Hellopeter. Here's the email I have received: Dear ******, Thank you so much for shopping with us at Red Square. We’re delighted to have you as our customer. We sincerely apologise for the delay on your order and would like to remind you how much we appreciate your continued support. We would like to re-imburse the amount to your account due to no stock. Many thanks, Tiyani Mawila Customer Service Agent | Omnichannel, E-commerce