in the facts and circumstances of the case you will have to serve a legal notice to your employer asking him to repay the entire full and final settlement amount along with interest within 15 days of receipt of the legal notice.

if they fail to do so, you can file a suit for recovery in civil Court against them in order to recover your Lawful dues.

Alternatively, complaint can be given to the deputy labour commissioner against them as well.

issue legal notice to your ex employer to clear your dues 

2) if dues are not received file summary  suit  to recover your dues with interest 

1. You can write email to Embassy of foreign country and HR head regarding you full n final payment not received.
2. Keep into cc External ministry affairs.

See you can issue a notice seeking your full and fin settlement and seeking interest on the delay and seeking notice cost from them.

Dear Client,

To claim left over , first send legal notice, still not paid, complain to labor commissioner.

Hello,

Were you a contractual employee or on roll? 

First step will be to send a legal notice to them then thereafter after seeing your terms of employment you may approach the court as per the conditions stipulated therein. 

Let me know if I can be of some help to you. 

Regards 

You need to first send a legal notice and thereafter file a Complaint with labour commissioner. It will be resolved through mediation. If not then you can proceed with the Complaint in labour court for trial.

1. Well, since your employer is defaulter in clearing your dues you have only legal recourse to explore to get your dues.

2. So file a civil suit in the local court for recovery of money.

3. The foreign embassy would not like to be embroiled in a litigation and hence it is expected that once you file the suit they would come forward and make out of court settlement of the dispute.

Send legal notice to HR HEAD and MD, by referring all incident. You will get soon, if not then approach to labour department. Thereafter you can file recovery case in labour court also. 

Give a legal notice reminding them of the due amount and also file an application with the ministry of external affairs so that they may exert some pressure on them. This is a unique problem and hence you could file a case in the labour court.

Regards 

1. Now serve a lawyer's notice to the employer to release the full and final settlement in a time bound manner.

2. If the settlement is still not done after notice from your lawyer then a suit for recovery of money with compensation and cost of litigation can be filed by you in the competent civil court,

You can engage the services of an advocate and send a legal demand notice first and after that you can plan to sue them for recovery