You first discuss with an advocate who is having through knowledge on such issues.
The society is not a registered body hence the bye laws made by them on their own by passing such resolutions are arbitrary and not legally binding on the members
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You can object to the resolution passed by them in the legal notice stating that the decision taken to consider the relatives of the members residing in the flats as tenant is illegal and against the natural justice as well.
The additional levy of maintenance amount is also illegal and not maintainable, hence the name mentioned in the defaulters list is defamatory, the society is liable to pay compensation for the damage besides seeking an apology for that especially when you have been paying the monthly maintenance regularly.
You can drag the society to the consumer forum for deficiency in service and also for functioning illegally with registration under the societies registration act.
You may also approach cooperative court seeking to ban the society which is functioning illegally without registration, especially while it imposing the non-maintainable clauses and untenable levies in the name of some fictitious stories.
You may discuss with an advocate fully at length and proceed against the society.
You dont worry about the past ruling on the subject.
Without taking a legal route you may not be able to solve this issue properly.
For choosing an advocate, you have to rely on your own prudence, i.e., you can come to know about the credentials and quality of an advocate while your talk to them and discuss the matter for 10 minutes.
You may have to be careful about the contents in the legal notice since that will be the base for the subsequent complaint as well.
In case of any doubt on the subject you can contact any expert advocate of this portal by booking phone consultation.