False advertising online at its best

I ordered a walled online that was advertised for R199 from an original price of R800. I received an email confirming my order. Later it was a Whatsapp message that the item was out of stock, someone then called and said it was bought in store same morning and was out of stock. I was then called and told it was a glitch on the system and they did not know how the item was R199, and that it was out of stock. I went again , item was still and sent them the screenshot, the item is still on the website for R1050. How do you explain that glitch.???