They got some free labor out of you.
Like Frank said they probably wanted to see how long you would stick around.
First clue was/is the filthy truck. If that’s how they welcomed new drivers…
CPM was a little low so I’m guessing W2 and not 1099. If that’s the case you have recourse through the State- hopefully you kept all docunentation.
If it was 1099 you are SOL.
Good luck driver!