My husband is working with a private consultant, Bangalore for a MNC. He joined on 21st May 2010 and deputed to Bhutan. They (Consultant) assured verbally that they would pay 21$ (twenty one dollars per day) per diem amount along with salary. He stayed there for two months and they transferred him to another client location in India. They did not pay per diem amount till date and the reason they told is they did not get it from that MNC.But, his colleagues from other consultant got their per diem amount. They were also assured verbally same amount as per diem amount and getting it regularly. Can you suggest solution for this?