Illegal termination without any cause and without settlement of dues.

My son was appointed by GM of 'KAH' on behalf of 'AHPL' (Employer). AR did not name 'AHPL' as a party to dispute, hence reference names only 'KAH' as party to dispute. An application was recently moved before the Ld. P.O. to add / join 'AHPL' but the Ld. P.O. has denied to add /join 'AHPL' (reason not yet known since copy of judgment not yet received ). He is also refusing to allow us to withdraw the case with liberty to apply for fresh reference from appropriate government. What remedy do we have now .