Promotion cleared by DPC BUT held by local higher authority.

I am working in BSNL, while working as DET ( Look after), I was promoted by corporate office New Delhi to DET ( Reg.) on 28/06/2018. But local higher authority framed a charge-sheet on Disciplinary proceeding one day before the date of promotion order vindictively. The bottom-line of the issue is that I was made chairman of a Bidding Evaluation committee on OFC works. There were other 2 members in the committee. There were 2 bids, one 28% and other 35% above the estimated cost. The committee unanimously observed rate is exorbitantly higher than the Est. cost and recommended neither of the bids and there was no dissent. Also committee recommended 'however considering the importance of the works, the competent authority may take expedient decision, which was completely Ignored by the higher authority ie GM. He singled out me and charge sheeted, which proves his vindictive attitude. There were other instances of his harassment with evidence.So advise me whether I can sue when Disc case