Waiting more than 3 weeks for stock

We are a retail company with reps out on the road using iPads and laptops linked to our Vodacom data contracts. We recently went to the Blue Route Vodacom shop to upgrade these contracts and obviously order new devices for our reps. We were told it would take 2 weeks for the devices to arrive, but now 3 weeks later, after several phone calls and visits to the shop, we still do not have our devices. We were promised by T****a and the manager on duty that our devices would be there on Friday by 4'o Clock at the latest, but when we arrived at the shop our devices were still not there. They also didn't bother calling us to let us know the devices weren't there, they just waited for us to turn up there, at which point the manager on duty at that time told us 'for security reasons' he can't even tell us when the devices would be arriving. We are a business customer and we need these devices ASAP, yet we're just expected to wait, when I could easily walk into any electronics store and buy them off the shelf? WHY?