Threat of false case by sc/st

I think this is a redundant question and I'm not sure if I'm asking this under the right head. My parents had purchased a flat in a building consisting of 8 flats over 4 storeys. The whole matter started when the guard of the flat, who belongs to a scheduled tribe, threatened to quit last year when a female resident of the flat started questioning his work and objecting towards favoritism of one particular flat owner. Huge fight ensued where the owner who favors the guard took his side and threatened to file a case in tribal court (the reason I mentioned that the guard belongs to scheduled tribe) for harrassment when the guard went away. Everyone backed out and the same guard was brought back. Fast forward one year, when my father finally retired and we were in the process of shifting in, the guard gives an ultimatum that he needs a raise of 1000rs or else he will go away. The owner who favours him the most panicked and started harassing everybody. Now, everytime the guard says he will quit, the fourth floor rrsident locks the door to the roof and demands that he will only open the lock if the same guard is kept. This happened last year and when the society (not registered) agreed to raise 500 instead of 1000 and the guard said he'll leave from next month, the roof was locked again. My father, the Secretary at that time, was given a threat over the phone that the fourth floor owner will make his life a living hell and he'll bring goons to sit in the parking area and harass everyone. The aggrieved owners decided to nullify the society and refrain from contributing towards maintenance. The guard, even though he said he'll leave and was given the last salary as well as informed that there is no society anymore, continued to stay for another month and is still living there and serving the fourth floor owners. He's adamant that he wants his salary and he doesn't care that the owners are fighting among themselves. Every week a new threat is issued by the guard and ultimatums are given by the fourth floor owners. The worst part is that one of the owner of the flat is a constable in the nearest police station and he's backing the guard. A new threat was issued that if we don't give maintenance, he (the guard) will seek the help of Mahila Aayog. What can be done to resolve the issue as half of the residents don't want the guard to stay becauee the trouble started with him and the rest of the owners want him to stay because he does their personal chores? I'm a single girl child , I don't with my parents and I don't want them to suffer because of these threats. Not only my parents but other residents too are so troubled because we are simple working middle class citizen and we have never been involved in such petty matters whereas the fourth floor owners are businessman and has his native place just down the lane and use it to his advantage.