Why advertise phones you don't have

Since May, I have been going from branch to branch trying to upgrade a contract. Problem is I want an iPhone 5, 5c or 5s, which are excellent phones and advertised at good rates. Not a single store in three cities has any iPhone 5 c or s and say they don't get them, they only get 6. In my opinion it is false advertising to advertise a product you have no intention of providing.