Debonairs pizza Protea Glen Mall complaint

I placed an online order for delivery from Debonairs pizza Protea Glen mall yesterday at 16:50 which was delivered timeously (thank you for that), at 17:55 I placed another online order to the same restaurant which was to be delivered to the same address but at 18:30 I received a phone call from a lady employed by Debonairs pizza Protea Glen telling me that my order will not be delivered because Debonairs pizza does not deliver to my area and in future I should place orders with Debonairs pizza Jabulani mall because Protea Glen does not deliver to my area. I explained to this lady that I've been ordering from Debonairs Protea Glen for a while now and they've always delivered, they even delivered to me an hour earlier so I don't understand how this can change so suddenly, she then rep**** that the delivery man was only doing me a favour with the previous order. If Debonairs does not deliver to my area then I should not be able to place the order, the delivery system should be able to notify me that delivery isn't available in my area, I hate that I succesfully placed the order but received a very displeasing phone call 35 minutes later telling me that they will not deliver. Please fix your ordering system, if Debonairs does not deliver to my area then the app should not give me a list of restaurants which can deliver to my area, I also don't understand why employees make decisions about where they will/will not deliver to.