1.Yes, you can prefer an appeal in district court/high court agaisnt the dismissal decree.
2. Yes the judgement of high court can be challenged in supreme court.
3. However appeal in supreme court is very hard to get admission. So if you win in high court you can remain sure about success.
4. I am not sure how and why lower court considered unregistered Release Deed as unregistered deed can be exhibited during evidence.