Dear Premlata
Thanks for putting the facts and your dilemma. It is gratifying to know that you are able to see the situation objectively, without taking the side of the unethical management of your company.
I also fully agree with others on this and the line of action suggested.
As you can see yourself, that the person is being victimized because he is upright and fair.
He is able to take every obstacle and humiliation in his stride, unflinchingly.
He has done his job and achieved his tasks and targets.
He was overlooked, deliberately, in case of increments for past five years.
It is so ironic and evil, that the management instead of rewarding and appreciating such an employee; is bent upon discarding him ruthlessly since he has delivered what was expected of him.
From his experience and ability, it is evident that he can go to Civil court (not being a workman) and present hiss case forcefully alongwith evidence and witnesses.
There is a good probability that he may win, which will be very costly and embarrassing for the management.
As such, it is better if the management pays him his rightful dues. As an HR it is your moral responsibility to see that this is done.
Warm regards.