If people are bothering you via the Internet, you can report it at any police station. Pune has its own cyber crime cell and has a record of taking quick action against the culprits.
The crime will be recorded if it is a cognisable offence, and then directed to the cyber crime cell. You can call the Pune cyber crime cell on 26123346 or send a mail at punepolice@vsnl.com

Here are the things you can do:

• Block the offender from your Messenger/address list
• Inform everyone on your address book to block your current address as your account has been hacked
• Inform the mail service providers about the misuse of your account
• Make it known to the offender in clear language that you will not tolerate any nonsense
• Communicate your intention of taking legal action if he/she does not stop even after warnings
• Do not hesitate in filing a complaint with the police
  .
  Don'ts:

• Don't talk to strangers online. You never know what might go wrong
• Be prudent in disclosing your email ID anywhere on the Internet
• Frequently change your password and your answer to the ‘secret’ question
• Do not use a password that also happens to be the answer to your secret question
• Do not disclose your password to anyone, not even your friends
  

  Sending obscene mail is a crime- punishable with imprisonment upto five years and fine upto Rs one lack.

Do's

• Do not click photographs by your mobile phones without permission. You  may be infringing the privacy of another.
• Do not reply to sms/mms received from strangers.
• Do not send obscene/pornographic text, images. SMS or MMS (multimedia messaging service) Do not transmit obscene/ pornographic material. It is an offence under Information Technology act, 2000, punishable with imprisonment upto 5 years.
• Do not give your mobile numbers while chatting on INTERNET to avoid “STALKING”.
• Do not keep your Blue tooth  open to all,  you may receive obscene/phornographic text, images and viruses.
• DO not handover your mobile phone to unauthorised service center, to avoid CLONING.

   Don'ts

• Don’t allow anyone to use your mobile in your absence
• Note down your IMEI number
• Use security pin code to avoid misuse of your mobile phones
• Anti-virus software should be loaded in the mobile phone
• Mobile phone keypad should be locked after every use
• Delete obscene/phornographic text, images, SMS/MMS, from your mobile phones