Your increment should be taken care after refixing the scale II pay and should have been added to your re fixed salary.

There's no necessity to give a specific instruction to add the increment that you are entitled to while refixing your salary.

You can give a representation in writing to the management about this and can approach high court with a writ petition for relief and remedy if the bank management is not responding to your request to refix your salary accommodating the increments that you are entitled to.

When the disciplinary proceeding was initiated JAIIB & CAIIB benefits were accrued to your basic pay. Punishment awarded was reduction to lower grade from Scale III to Scale II. Punishment does not touch increments due to JAIIB & CAIIB. When order of punishment does not speak about such increments, it means that said increments have to be continued. Had there been denial of the same, it would have been mentioned in punishment order. Approach High Court  in writ jurisdiction after issuing lawyer's notice you will get arrears of increment with interest, costs of writ and lawyer's fee. Order of punishment is to be interpreted strictly without drawing any presumptions.    

If the order is silent about the restrictions towards the increments for JAIIB & CAIIB, then it is deemed that the disciplinary committee has not restricted anything in this regard, therefore the stand taken by the Bank in this regard is disputable.

You can approach high court with a writ petition to challenge the refusal to accommodate the entitled increment to your salary for the reasons you rely upon.

You have stated that you had submitted representation i this regard to the management, whether the representation was in writing  sent  through proper channel or have just emailed them and remained silent waiting for their response?

Besides you have not stated about the response to your complaint lodged in the staff grievance portal(?).

You can discuss with a local lawyer who is expertise in service matters and proceed as suggested 

Dear client I am sorry to hear that but in this case you may find a complain against the same to the head office aur file a case against it.

If inspite of representation bank is not taking any action file writ petition in HC against the nationalised bank denying you rightly earned increments 

Act as mentioned herein above 

In the circumstances, it is better to approach your trade union and be guided by their advice. They may take up with the management on your behalf and sort out the issue. If you decide to fight your case alone, the management may prove to be vindictive.

You can check whether you are a workman under ID Act else approach civil court for redressal 

- As per Supreme Court , when an employee is held guilty and penalized and is, therefore, not promoted at least till the date on which he is penalized, he could not be said to have been subjected to a further penalty on that account. Denial of promotion to the employee in such circumstances was not a penalty but a necessary consequence of his conduct.

- Further, in cases where, after completion of the disciplinary proceedings, an officer has been punished with minor penalties, he shall be given promotion from the date his immediate junior has been given promotion and his pay will be notionally fixed in the time scale of the higher grade with effect from that date.

- Further , in cases where an officer has been punished with minor punishment of “suspension” then the officer cannot get promotion with retrospective effect. In such cases, the date of promotion of the officer concerned will be postponed by the period for which he was actually under suspension.

- Since, your promotion was already effected by that punishment and you was degraded , then on the ground of qualifying the FAIIB and CAIIB your promotion & increment cannot be stopped .

- You can issue a legal notice and on refusal file a Writ Petition before the High Court.