Had to get a BB curve replaced twice with Verizon (i broke the phone both times, so can't blame verizon for that). Never had the run around.
I've found the key is to rapidly escalate both temper and volume. Be nice at first though, and give them a chance. yes, if it comes to it, you might have to be a bit of an A-hole, but start making enough of a scene, and the sales people start shooting the support reps dirty looks. You need to make it apparent YOU have a problem, which now makes you THEIR problem. A new phone is the only way this problem goes away.
Plus, do think the people in the store will view me as the a-hole, or will they assume Verizon is giving me the run-around? This tactic is simply the result of the carriers polices.
And yes, I know the front line reps aren't the ones who made verizon (or any carrier) what it is, but they knew before they chose to work there that this would be part of the job.