Poor Service Delivery

My brother had purchased a lounge set on 18/09/2021 from the Pavillion branch. Delivery was scheduled for the following week, however there was a problem with the truck and also stock issues in JHB. Upon speaking to the salesman who had then offered a discount on 2 October 2021 but changed that on 03 October 2021 as the delivery was now scheduled for Monday 4 October 2021. On Monday afternoon he was then notified that there are still issues and the manager decided to deliver it to another customer as there was a backlog of 7 sets. My issue is: 1. Why advertise goods when there isnt any stock available 2. Why was he not notified about this at point of purchase, as it was still my decision of going ahead with this purchase or not 3. Why the false promises of a discount which was not carried through 4. Is the salesperson even allowed to say to an existing customer that the delivery has gone to another customer We purchased from your store knowing that you are a reputable business, but clearly I was wrong This purchase was cancelled and we purchased the lounge set from a different store, where we actually received delivery the very next day from the day of purchase. We have raised our issues above and hope in future that this does not happen to any other customer and also myself if we do intend to purchase from any of your stores again.