No Stock on Advertised phone for 3 weeks

I am due for an upgrade and have been looking at getting the Sony Xperia M5 that has been advertised for more than a month now.<br> <br> I have been asking the Mtn store at the Glen shopping centre for the last 3 weeks concerning this phone but it has been out of stock and none of the staff can assist me with and order or give an ETA on when this phone will be available.<br> <br> The staff at the store are very courteous and i am not blaming them. They have taken my phone nr and have said that they will inform me that as soon as it becomes available.<br> <br> It just seems very unprofessional to me that a company advertises a product and then does not have it in stock for 3 weeks +.