Harassment from anonymous caller

Hi

I was wondering if there's a helpline to report an anonymous caller who keeps sending unsolicited SMSs/phone calls to women. This person calls up asking for 'Navin' and if it's a woman, pesters them to talk to him. If they don't pick up the phone, he keeps sending annoying msgs.

I even called this person and shouted at him but he just refused to stop. Is there something we can do?

I know there's a very effective helpline for this in Delhi (http://www.igovernment.in/site/Delhi-Police-anti-obscene-calls-cell-is-a-hit/) but I couldn't find anything in Bangalore.

Thanks,

Rajiv