What a putrid shopping experience.

I am really disappointed in this experience. I found a product I was looking for for quite some time and a good price. I paid for it, and received my invoice and payment notification immediately. Waited over 10 working days, and decided to email them because I received nothing yet. They responded saying "Please note the item mentioned is out of stock." WHAT THE HELL? Why take my money without the item in stock? This is a complete ripoff. They then proceeded to ask for my banking details to process a refund. Best believe if I don't receive my refund, I will go on all platforms and make sure everyone knows this site is a ripoff!