Pre-Ordered But No iPhone 15 Pro Max

Shocking service from the iStore. Ordered the iPhone 15 Pro Max on the day that pre-orders became available. Yesterday they call me saying they don't have stock, I need to pay R5500 to get a model with more storage. I pay it. Today is the release date for the phone. No delivery. They didn't even contact me to say there is a delay. I contacted their customer support. They have no idea when they will have stock of the phones. I ask for a refund, they say 5 working days. What a waste of time and money. I could have bought the device at a store and had it in hand by now. Awful service from iStore.