Can delivery really take in excess of 2 weeks?

On Saturday the 11th of April after a hefty disappointment at the Riverwalk branch of MTN I continued my quest for an upgrade at the MooiRiver Mall branch. I order a phone to upgrade to, and was helped very quickly and effectively, however. While the form was being filled in the question arose, how long will this order take(as they did not have stock). The person who helped said that this order would take approximately one week. After one week, they had still not received stock. I returned to ask about the matter, but the blame was simply shifted from them to them not having received stock from the specific supplier. I returned to the other MTN with the hope that they would possibly have stock or be able to tell me how long the orders take, this man immediately said that their orders take 2 weeks. This is irksome. I have returned to MTN MooiRivier Mall 3 time, each time hearing the same excuse, how is it that they cannot order from another branch, give me an approximate delivery due date, how is it that no plan can be made. In future I would appreciate if they under-promise and over deliver rather than the opposite!