We were renting a place earlier that in which one of the earlier tenants was being chased by loan sharks.
1st 9 months we had no trouble whatsoever. We didnt even know what loanshark meant, lol.
Then one fine day when I ready to go to office and opened the door, I was greeted with the beautiful modern art in Black paint on my door. We informed the police.
Then about 1 month later no paint was splashed but they wrote in the corridor O$P$ and the old tenants IC no etc. Also they screwed up the letter box and I couldn't open it and had to call the lock smith.
I informed the police again and was advised to change our house. They said they cannot patrol a particular house continuously and have to attend other cases which are more severe like attacks once every week
I was also told that they wont really harm anyone. Worst thing they could do is take a cycle lock chain and lock you from outside.