Just my 2 cents...Id have the people effected by this to contact their phone company and have the number blocked. You can contact the non emergency number of your local authorities and they will sometimes accommodate you and call the individual. Or depending on your local laws you can also press charges of harassment.
I would say this violates the play nice policy :
DO NOT use racist remarks. DO NOT harass people. Limit your use of profanity, especially in public channels. Remember there is a difference between cursing and cursing at someone. You will receive warning, and if you still refuse to cooperate, you will be banned.
Guess it depends if he has done this before. But id work on getting some screen shots together and petition it
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