They did the same thing to a driver in the other center in my building when I was in package. Guy they wanted to fire that they followed everyday and had trouble finding him doing anything wrong. They cut all his OT. He was getting 7 hour dispatches everyday and then came back and swept floors for an hour. He got fired shortly after for doing something stupid. I don’t know the driver but I heard the story and I think he tried to file a grievance and was told he couldn’t.
Nobody should have told them they cannot file
If you fax it yourself, and keep a record of doing so, this is an easy slam-dunk case of misrepresentation when they don't act.
Our stewards will help us write up a griviance, but never have I heard a preload or driver steward tell them not to file.