[SuPeRw00t]

As long as you are at a corporate store, just ask to speak with the manager. Don't be rude or yell as it is not their fault the replacements have been crap. If you explain the situation of getting 3 bad replacement phones (they will verify this on their end) and you have legitimate time lost dealing with this, it is within their power to replace you with something in store. That may be a mogul, or it could be a pro. Kill them with kindness and they will treat you right.