House members DO "represent" us, by definition, they may not represent what we individually would prefer of course. Most bills these days have entirely partisan votes, on occasion 1-3 may cross the aisle. So, as much as anything else, the simply vote in lock step with their Party. On everything.
It's not as if lobbyists tell them how to vote, the Party does that. Lobbyists MAY help insert certain clauses into legislation if the Representative has enough influence.