If an employer had terminated instantly without notice period there is a condition.
On what basis the employer was terminated?
Whether the employer is a confirmed employee or in probation periods?
If in case of probation period and the company doesn't like the employee service they can terminated at any time without prior notice which think that they will lose their business.
If the employer is confirmed and terminated due to any compliance issue or doesn't abiding company policy then in that case they have to give him termination letter on the basis of the condition.
However apart from it, if they terminate then they should pay two months salary with full and final.
But if the employee accepts such termination (whether legal or not) and only interested in full and final settlement, then there is no initial requirement for going to the Labour Commissioner. Full and final settlement can consists of salary, bonus, incentive, gratuity, PF etc. and all these components cannot be claimed before a single forum/ authority.