AT&T and FedEx nightmare!! - - HELP PLEASE

Can someone please help me?  I ordered an iPhone 6 over the phone and upgraded my service. (hindsight - BIG mistake on both)  Long story short, FedEx has a record of the package entering there center and nothing more.  They have communicated to AT&T that the phone has been lost and the matter handed over to there security.  They have also provided a case number that references this fact.

Here's were the nightmare begins...

My service provider who charges me an insane amount for my monthly service has advise they can not send out a replacement phone!  I'm basically being held responsible for a phone and situation that I have zero control over.  It stands to reason that if the phone has been lost, follow up with FedEx and send another phone.  I'm being told it will take an additional 5 business days to resolve this matter.  By the way that's a minimum of 5 business days.

For the last three days I have called AT&T twice a day.  The answer from each person is the same.  The answer from the next level supervisor is the same.  Each has the audacitiy to end the conversation by asking, "can I help you with anything else?"  I'm thinking to myself on each occassion, you haven't helped me!!!

Can anyone offer some assistance in resolving this matter?  

The phrase "Customer Service" should stricken from there employee vocabulary/handbook.  They have no idea whatsoever what the term means.  Everytime I think of those three letters by blood broils!