Unknown — harassing and abusing calls

Sir,
Mobile no.[protected] is continuously making calls in midnight of my wife number and talking vulgarly. After so many times scolding from my wife the person is calling again and again.
When i search the number in facebook the name shows rakesh. The facebook profile link is https://www.facebook.com/profile.php?id=[protected] and in true caller apps it shows as delhi nunu kaka motihari.
Please help sir.
Thanking you
Ramesh kumar