Any ideas on how I could get Trek to assist with this?
contact the dealer you bought the bike from..
Standard practice, there are inventory cards for every bike built up in the shop.
Buyer fills in the sold to: information , and it's on file.
If you just bought the wheels, 2nd hand, and are not the original buyer of the bike .
you got no claim at all.
then you start from scratch , pay retail for a new, same kind, hub.