Double-check that you have the same seats. The credit procedure requires the CSR to actually cancel your tickets and rebook them; usually they remember to rebook your seats as well, but once in a while someone will forget.
As for refunding the/any price drop (not the OP's question), that's not realistic when the fare purchased is nonrefundable. Most airlines would charge at least $150 to do the same thing. JetBlue and Southwest (and AirTran?) charge nothing.