I need help to get rid of this ?

My mom befriended this guy. The guy is a Loser. He is stingy, a liar and annoying. He doesnt have a house or car. He lives with his brother a house down from us.My kind deseperate mother gave him the house number and this loser calls 20 times a day every day. he only calls when he wants to go somewhere. As soon as he see my mothers car he starts dialing. My mother cant even shower without him calling. Ive disconnected the phone and rigged it so the phone wont ring. If my mother doesnt answer the phone he will come over. My mother hid all the weapons so i cant do bodily harm to him. how can i get rid of this