Re: Bullying?
Was there any mention of your work ethic in the initial interview process? Was there any indication that they were looking for extra commitment as well as skills? If there was a probationary period, how did you pass through it, if it is obvious now, that your performance is not satisfactory to your boss?
In the past I interviewed employees who promised the "sun earth and moon" relative to commitment, but whereby I would still have to step in and take over a job, as they had left at 5 on a Friday (in their company car!).
It's sometimes worth it if people (not necessarily you) , reflect on what they promised, in order to get a position.
Relative to the nature of your skills, I imagine that work (breakdown), and clients business hours cannot always be defined, so maybe it's a case of "being in the army and wearing the boots".