Business closed on salary day after working for a month. What remedy?

I understand that you worked for a person who took work from you but did not give you any salary. Did he issue you any written contract for your services / or an appointment letter of your role in his company?

I understand that the person owned a business. Now if you have the proofs of his closed business and some proofs that you worked for his business then you can definitely file a petition in the labor court seeking for your labor rights. In case you do not have any job appointment letter or any conditions or any written contract, you may get only the conveyance and the compensation for your harassment which may equal to your 1 month salary.

If you have a proof of employment like a contract or an appointment letter and you can prove that you worked for a month (emails exchanged / attendance record / etc.) you may file a recovery suit for your entire month's salary along with the overhead expenses made by you like conveyance, etc.

You can also file a Criminal suit against him but first you need to inform the local police authority through a written complaint. After that you can file a criminal suit under section CRPC 200 and IPC 420.