Please read Apartment association threatening where I have mentioned that society cannot disconnect the water supply, which is an essential service. You can file a complaint to the competent authority under the societies related law of your state. If the society has an issue of non-payment of the maintenance charges by a member, it can sue the concerned member for recovery of the same, but it cannot disconnect water supply.
In fact, in your case, you have mentioned that there is not even an association (of flat owners) formed. Then how can they disconnect water to your flat, since the water connection would be in individual names (as there is no association or society)?
You can keep a record of all their threats and inform them in writing about the legal position.
You should also contact your landlord / lessor in this regard, and try to sort out the matter through him. If needed, issue a legal notice to the lessor. There must have been a clause in the lease agreement as to who would pay for the capital expenditure to be incurred for repair, renovation, etc. There may even be some indemnity clause in this regard.
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