What would you advise me to do?

Do you have an approved/valid Advance Parole? If so, you should be able to travel on it as long as still valid. You need to first figure out if you...

What are problems in my case and how can i do everything in right way what to do.

You may be still eligible for a GC but you would need to overcome the aspect of using someone else's SSN. I suggest setting up a consultation with...

What legal recourse do I have

This is not an immigration question. You should consult with an employment based attorney.

Consequences in this case and chances of getting green card

This is a duplicate post. Please seek a consultation with an immigration attorney.

N400 and citizenship

They will mail you a notice. Be patient and wait for a decision at this point. You have done your part, they have to now make a decision.

Do the person have to be in the same states to do the join affidavit?

No there is no such requirement for being in the same state. They have to residing in the United States though.

How many months I can take leave per H1B policy? If I want to take 4 months more leave will I be out of status?

Talk to your company's immigration attorneys and HR.

The most recent tax year on form 864 means 2015 or 2014 for my case?

It would be 2014 returns until April 15th 2016.

You can apply regardless of you having a visitors visa. Pls talk to a qualified immigration attorney.

Misuse of H1Bs and exploitations of IT professionals

This is a repost. Pls see previous responses.