Vodafone — Vulgar calls coming

Vulgar calls coming from [protected] to my wife on [protected] from past four days. The data provided above is input search from net. He use to call my wife when I'm in office. Call comes around 8 am to 9 am in the morning. My wife is in fear on seeing unknown mobile number on the screen. I have called him at around 5 pm but he refused to talk to me.Please do the needful.