I recently upgraded my tab plan in order to get a new phone. I had roughly 20 dollars left on my previous tab which I agreed to pay off in order to make the switch. However, on my first bill with the new plan/tab I notice it lists "tab payoff" three times - all at the same amount that was remaining on my previous tab. Does this seem like an error and like I've been overcharged or am I misunderstanding things? Thanks!