Neighbors harassment: cut electricity connection to water pump

Hi My senior citizen parents are living alone in Delhi in 2nd Floor and a property case is going on with our 1st floor neighbors. Last week they went outside to another for one week for traveling and on coming back found that our electricity connection with water pump is cut. Electrician we called said that the neighbors had disconnected the connection by cutting the wire. Now we cannot turn on the water pump to get water to 2nd floor and cannot lift water in mornings and evenings. What can we do to complain on this, we can install second wire but again they can cut it if my parents go for short time.