What to do if builder is not ready to do maintenance work in building

There is leakage in flat since 7 years. I am resident of Mumbai. This is due to unconstructed portion of E & F Wing - 11 to 13th Floor and my flat which is in D Wing at 11th Floor is facing unconstructed portion. We have registered Co-operative Hsg Society. I submit request every year but our society manages to cover wall with tarpaulin which is insufficient. There was one instance of Short Circuit too in year 2012 due to leakage. I am submitting request since several years but no formal reply from Society. Currently I am part of Committee member but not office bearer. I am regularly paying my maintenance. Since the leakage is from outside wall, Is society liable to get issue fix up with proper plastering. The builder is suppose to start pending construction work but no specific date as we are hearing since 2 to 3 years. Since our society consist of 272 members from A to F Wing, we are facing difference of Opinion on construction issue. How do I resolve issue? I am almost losing my pat