Withheld the Earn leave, Gratuity and 20 percent of pension.

My father was an regular employee of central Government. He was retired from his service on 31/01/2002.. On the date of his retirement a criminal enquiry was going on in a FIR lodged against him, but no charge sheet was submitted against him in any court and no cognizance was taken till the date of retirement. Moreover the FIR was also not lodged by his department but it was through a source and lodged by CBI. Even till the date of his retirement on 31/01/2002 not a single show cause was issued by the department against him. when my father lodged a case against his department to release his 20 percent of withheld pension/ all his gratuity and earn leave encashment it was falsely replied by the then authorities of his department that a case was pending against him so under the ccs pension rule 69 and ccs leave rule 39(3) only 80 percent of his provisional pension was released but his all gratuity and Earn leave encashment were withheld. My father is very innocent person and he was shocked seriously and till now he has been under treatment. Now when in 2023 I hv come to know all this conspiracy against him I am asking any remedy for him.