Help!

We have been living in Mangalore since 30 years now. Currently my (single) mother(senior citizen) lives alone. We have an adjacent neighbour and their family who are notorious for creating problems since years now. We have no talking relationship with them. They love to fight in the most uncivilized way. Their problems range from blocking the entrance to our house with their visitor cars and then have the audacity to argue about it, children playing in their premises and kicking balls right at our doors and windows, stepping into our compound without permission, water drainage issues and what not. Their problems don't seem to end. What is the ideal way to tackle this? I'm looking for a way my mother can reach out for help when I'm not here. Is there a police helpline where timeley help is ensured? Honestly after 30 years, I'm just fed up of them and have to resort to this.