Item not delivered

Was promised delivery by Monday, and every day since then. Then they tell me that they can't help me because the person who helped me is not in store today. I ask to speak to the manager but they're also not available. Was told that they oversold on stock and don't have the item, then when I complain they I'm told moments later that my item purchased is in the store but they don't have drivers for delivery. This was on Tuesday. No timelines for when I can expect delivery. I've been told every day that delivery will be done on that day, then I hear nothing back. Unacceptable.