Signed for a phone they don't have

I was due for an upgrade for which I app**** for the new iPhone 14 Pro Max. I was approved but they told they had no stock but I was assured they will receive new stock by Tuesday and they had me sign the paperwork and everything to secure the new contract. It has now been more than a month and I never heard anything back from Vodacom. I visited the store multiple times afterwards but they are not helpful at all and just tells me that they don't know when they will receive new stock. It's been more than a month. Why have I been **** to for them just to get me to secure the new contract? Little to no effort from them to actually help me get the product I signed for. Not even any updates on what's going on.