1. Are you a registered Association?
2. If you are not a registered association, have you got a Memorandum of Association passed at a General Meeting of all the members with recorded minutes the meeting and attendance with signatures of all the attending members.
If so, what you can do will depend on what the MOA says. MOA should say about Office Bearers, how they are elected /appointed and their powers. If so you can file a civil suit following what the MOA says. If you are not registered, nor do you have an MOA anyone who says that he represents the Association can be challenged in a court of law.
3. If you are a registered Association under which Act are you registered?
I think the number of members you have, is not sufficient to form a co-operative society.
Other available registrations are (1) as a company (2) under the Socieites Registration Act or (3) registration your MOA with Registrar of Assurances.
(1) If you are registered as a Company the Law provides for the recovery of dues, which you can follow. You will have to engage a lawyer.
(2) If you are registered under the Socirties Registration Act, in Maharashtra it is compulsory to register under the Public Trusts Act also. The latter provides enough powers for recovery of dues.
(3) If your MOA is registered with the Registrar of Assurances, it is better than an unregistered association with an unregistered MOA. You will have to follow the civil suit route.