If the "Let's Talk" rep didn't put the original transaction through as a "port request", i.e. if your wife didn't indicate to Let's Talk that you wished to port a number, you will indeed be getting two new phones with two new phone numbers on Wednesday. It's gonna be a fun time getting those numbers port-replaced after activation. You may wanna give "Let's Talk" a call back to see how they plan on fixing that for you. If I had to muster a guess, my hunch is that "Let's Talk" wireless isn't capable or at least that particular rep doesn't actually know how to initiate a port request, so they lied to you in order to do the easiest thing for them, which is to activate two new phone numbers.
Low price, Excellent Service, High Quality. Pick any two, but you never get all three.