@ptc
Sorry, I was just reading the posts in here, and thought you need advice. Find your Manager or Boss from this Closed Company. Get him/her to write a letter with your duties and sign it. Accompany this with his proof of employment (offer letter, relieving letter, salary slip, whatever he/she agrees to provide), that proves that person was employed in the capacity you claim, and this person is providing a letter stating what you did there. If you can get more than one person to do this, that's even better.
Though the situation you are in has no definite way out, this is the best way you can handle this for now.
Also, if boss is not available, you can try colleague. Good luck.