What do I do when a warning is ignored, and I am still harassed?

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I am just curious to see what others would do in this situation. My stepson has a "friend" who is not a very good person. When they are together, they always get in trouble, and they are smoking marijuana, etc. Just a week or so ago, they were riding around in my stepson's truck, got pulled over by the police, and the "friend" was arrested because he had marijuana in his pocket. Luckily, they only impounded my stepson's truck, but did not arrest him. Anyway, I have blocked the "friend's" phone number so that he cannot call my house. That is because he calls, hangs up, and calls right back - over and over - until my stepson answers (which he doesn't usually do). Needless to say, the phone is driving me nuts - so I blocked his number. He keeps calling from different phones doing the same thing. Everytime he finds a new phone to call from, I block that number too. I have 4 numbers blocked that he calls from. When he cannot get through on the phone he comes to my house and knocks at my stepson's bedroom window. So get this - Yesterday we were gone to the movies. The boy came over to my house (because he thought my stepson was home in his room asleep), threw his cell phone through my stepson's bedroom window, and then called his cell phone 28 times from his girlfriend's cell phone. He thought my stepson was in his room asleep, and he was trying to wake him. Is that nuts, or what???? I know he called 28 times, because the phone had 28 missed calls from the other cell phone. My stepson told him he needs to quit calling and coming over, and that when he (my stepson) wants to hang out, he will come to his (the friend's) house. But we just cannot keep this boy away. Honestly, would you continue to call a house that has blocked you from calling? And it burns me up that he has the nerve to come on my property. He is so pushy and so aggressive! My stepson is 20 years old, and I cannot restrict him from being friends with this person. But I DO NOT have to allow his friend to have access to my home. What do I do to keep this teenager away from my home? I am my wits end.