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T-Mobile on Facebook or Twitter or via phone is probably the best way to get this rectified. The promo details probably stated that both lines had to sign up at the same time to receive the promotion. You can add the other line to your account and try for the two for 100 plan but as far as the free device goes I pretty much bet on that having to have been done at the same time.
The only other issue I can see you having a problem with is the fact that you went to a third-party reseller instead of directly to T-Mobile so that promotion may have another pertinent detail having come from Costco.
Hi there, tortoisequeen! I know it's been a few days since your original post -- we just wanted to touch base and see how things are going. Did you have a chance to work with our T-Force team to review eligibility and get to the bottom of this? We're happy to have you guys, we want to make sure this is the best possible experience!