Not reliable with sales

I have been assisted by 3 consultants now and all off them are giving me different information, first it was that they are awaiting stock from mtn, secondly is that mtn does not have it in stock so they have to go check at the warehouse, thirdly is that there a problem with the system my purchase is still in process after being told it has been approved.

I am confused by the fact that why would you sell me something you don't have, after the lady double checked that they do have it in stock when I was doing my application.