Can i will get permission to used garage as residence

Dear Sir/Madam , I am holding Garage, Small Room & Toilet near side of building in Sahakar Nagar No.2 Pune.PMC has sanction the plan in 1988 with six flat & Side Garage & small Society office room with toilet.I have purchase that property from developers. Developer has kept right for using that garage , Society off.& toilet as a residence. I have Purchase that property & I have started using that as my office. For two years I Have used that & in our area there are so many peoples are using Garages as residence or offices. But last four years back other member of society has raised objection that Garage used is illegal. They made complaint in PMC due to that I have to closed that office. I am having the rights for using terrace, half Parking & for future FSI to be used on terrace. Developer has made Deed of Apartments & in that he has kept all rights to him self & I have purchase that from him. I have to asked weather it is illegal or legal. Can I go in Court against society member. There is no register society. Only six flat & My garage are there. Pl guide me what action to be taken.