the post of the Heavy Duty Truck Driver or his regularization in the said post with effect from 19.10.1989 or the date when he was allowed to get the selection grade through the proceedings of the respondents dated 16.04.2002. Under such circumstances, without any basis, the respondents had issued the impugned order by cancelling the selection grade pay allowed to the petitioner from 19.10.1989 and revise it with effect from 01.01.2015 and consequently, issued the recovery order. At no point of time the petitioner was reverted to the post of Light Duty Vehicle Driver by citing the reasons that he did not possess the qualification or experience. Having allowed him to function as Heavy Duty Truck Driver on being satisfied with his performance as Heavy Duty Truck Driver, the respondents cannot down grade his benefits by counting the selection grade entitlement only from 03.01.1995 by stating that the petitioner has been given with the regularization also from 19.10.1989 in the post of Heavy Duty Truck Driver and he is not entitled to count his services as Heavy Duty Truck Driver on and from 19.10.1989 for getting the selection grade pay. Even for the sake of argument, it is accepted that the petitioner is not entitled to count his selection grade on and from 19.10.1989, the mistake is not on the part of the petitioner and that too, the above order is passed without even putting the petitioner on notice