What can I do when someone won't stop harassing me?

Hello Sir/Mam

If the person is harassing the girl then get a criminal complaint drafted against that person and send it to the concerned authorities 

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Thank you

If he is doing any such activity, you can record such evidences and can approach cyber cell or if you are sure that its him then you can log a criminal complaint against him in nearest the police station. My sister broke up with her ex 3 years back. Now he is harassing her through email. He is sending her the photos she has send him. Not nude photos. Just normal photos. What can she do to stop him.