Flat 301 owner is highly problematic

Q: The owner of the flat 301 is creating a lot of problems. He has not given a parking space and constantly keeps asking for money.

He invades privacy. He has the keys to all the rooms and cupboards and keeps coming to the flat when the inmates have gone to office. He even keeps asking for money and says dues are pending when they are not.

He even did a fraud on the house tax. He asked the inmates to go out of the house when the govt inspector was supposed to come so at show that the house is not given on rent and they could save on the house tax applicable when it is given on rent.

He keeps telling that we will cut money from your deposit.

We are scared that he might not return the full deposit when we leave.
Is there any way that action could be taken against them? Probably, a police complaint will help?