I wouldn't even have signed them on in the first place. They have no respect for you and YOUR business.

If you need to term ASAP, here are what I would give as my terms:
1. arguing about price
2. lying to my face
3. health concerns
4. dropping off not on the contracted times
5. very pushy

I have a 3-strikes and you're out policy. Trust your gut and get rid of them ASAP.