Mhada torturing senior citizens

My parents live in a paghdi property in Mumbai. Our family has occupied this property for nearly 90 years and 4 generations have been born and have lived in this house. We recently had a change in landlordship and the new landlord has gone to Mhada and asked them to pull down the building under the pretext of it being dangerous. There is absolutely no problem with the building. Mhada has used its powers and started breaking the building from the top. They have come down from the 5th floor tp the second floor and are now pressurizing my parents who occupy the first floor to vacate the premises. All the banging and breaking has not caused even a single crack in our property so it’s clear that is not dangerous at all but Mhada and our landlord are still hell bent on getting my parents out. My parents are retired senior citizens with no where else to go and not in a position to spend money on legal costs. How should they approach this situation? They want to continue living in the property peacefully.