You would have to approach labour court with your grievances. Also, in interim please give them a legal notice stating the facts of the case. If you have documentary evidences to prove injustice, it would be in your favour.
Under Constitution begaar or non-payment of salary/dues are not permitted. Alternatively, Industrial disputes acts, Standing order including labour law provisions would be applicable in your case.
Have you officially given any letter of resignation to them? In case if its given then you would be only entitled to your pending dues.
Please let me know should there be any further questions.
Thanks,
