Neighbor harassment

Dear sir/mam I am a 27 yrs old female doctor. Me and my mom live in a 4 storey house where we own 1 floor. The ground floor is for parking. Our neighbours have been creating nuisance by always nitpicking whenever we go out of the house and makes such a situation that we have to fight. They have an elder mother who always keeps on nitpicking and their sons intentionally let their mother go forward for creating trouble. We have a common entrance with parking gate. Now to create trouble they have given the keys to someone on the basis that they are allowing someone to park in their space. As me and my mother live alone , we want safety so requested that they dont give the keys to someone else and we dont have any problem with them letting their parking to someone else but they refused. That guy even comes to park even at 11-12 at night and i dont feel safe. When we asked that guy to give us the keys they said that this is my house and i am like the neighbours son with full atitude. Our neighbours now are abusing us by saying that whenever some family comes to see me for arranged marriage they will interfere and say that i am a nuisance and create a chaos in your house if you take the rishta and started abusing us with galis. I know they have the right to give keys to anyone but thats the shared gate and we want safety with us 2 women living alone. Can any legal procedure be taken in this case?