CSP Paint Process Engineer interview questions

HR and Hiring Manager invited me to go to plant and promised me reimbursement. I went to the plant getting all difficulties. After coming back from plant, not a single phone no communication. It has been one and half month, they haven't even paid me travel reimbursement. Every week, they are waiting on something. In the meantime, I accepted better offer and started another position while they are playing with my reimbursement.