There is no legal system in place to counter owners and housing societies refusing bachelors to stay in their apartments.
The right to allow tenancy lies with the owner.
The title of ownership clearly mentions that the person may use the said property in any manner as desired.
Therefore, if the owner wishes to give the flat on rent to the bachelor, it is legally valid and nobody can stop him from doing so.
Actually you should not have allowed or agreed to pay extra maintenance when the society demanded.
The society has no powers to put restriction on you even if there is a resolution passed in this regard.
You could have taken p this matter with the registrar of societies or registrar court itself
Well you can issue a legal notice for charging the extra maintenance even now while there is a family residing in the flat and get it corrected or drag the society to the court of law.