Can society stop me from entering if I don't have rent agreement.

I'm living at my brother in law's Empty Flat for past 4 months alone without rent agreement & without paying any rent. The society sent me the below notice on whatsapp :- It has been observed that despite numerous reminders, many of our owners are not sharing Registered Rent Agreements & Police Verification on timely basis. Please be aware that this is the main priority keeping in mind Owners/Tenants safety and prime objective of our Society as per by laws. We have gone through entire file and noticed almost 80% of Owners are defaulting in this process which is a major concern and would like this to be rectified on or before 15th FEB 2021. Most of the existing tenants contracts are Expired or have missing Police verification. Below actions will be taken post 15th FEB:- * We will conclude a similar exercise post 15th FEB and will share the final list of Society Tenancy status with HINJEWADI POLICE STATION. * Defaulter Tenants entry will be prohibited post 15th FEB. Henceforth, New Tenants will not be allowed entry without Registered Rent Agreement along with Police verification to be submitted before their entry in Society. No requests will be entertained moving forward on this. As my brother in law is at his hometown, so I won't be able to make any rent agreement. What should I do?