Oh man, that had to suck. It's like the rep was trying to accuse you of doing dirt when you really weren't doing anything wrong. And yes, the VZW 5S is unlocked as is the VZW Galaxy S5. Tbh, some carrier reps are just...yeah. As a matter of fact a lot of the people that come into my store say that they prefer dealing with BBY over an actual carrier store b/c going into a carrier store is always a nightmare. Plus from what I've heard, a lot of carrier store are trying to push people into those Next, Edge, Easy Pay, ect plans...as opposed to letting the customer upgrade with the standard 2yr activation amd keeping their plan the same.
Plus, carrier stores don't price match. Working at BBY, I have to deal with all the carriers and all their reps. I still say Sprint's reps are the absolute worst. But yeah a lot of cell phone reps/sales associates don't know that much about the actual technical aspects of the phone. Now with that being said, you do get some every so often who truly know their *****. You also get customers who act like they know it all because they visit androidcentral or Engadget...when in reality they don't know anything. I actually experienced that in my store the other day. So annoying.