I don’t think anyone here can answer that question for you. It’s easy to blame bike shops, and they may be at fault here, but if those bolts (which have likely had salty sweat dripping on them, and possibly heaps of salt water if you’ve done sea based triathlons) haven’t been pulled out and regreased every few months then of course they will seize. That’s not the fault of the bike shop.
ETA
In view of the expected use of a triathlon bike taking it up with Trek that those bolts are not fit for purpose may be a different matter, and not what I am referring to above. I am merely referring to the poster who said the shop should have given you a new bike when it *may* be absolutely no fault of theirs.