False advertising on stock

We ordered an aluminum Charcoal sliding door and window online on 06/01/2020, when placing the order(and paid for it) it did not specify that there was no stock and order was placed successfully, stock can be pickes up in store in 10 dys. Went online today to see the status of the order it showed 'On Hold'.. Called the number on the web page and spoke to Ayanda whom advised that it could be due to no stock but will check physically as it could be a system error. We received a call now from 3 consultants advising that we can come get a refund. WHY ADVERTISE SOMETHING WITH THE IMPRESSION THAT YOU HAVE STOCK WHEN YOU DONT!!! we paid immediately for our items but you cant.