Prank Calls prank calls from a unknown person

Dear sir I am very much frustrated with a prank caller from Gujarat who call me 10 times a day on odd hours I want u to please take some actions on it am a student and I study late night so when I get calls from this person I get very much scared the no. From which I get these calls is – 7817932099 I hope u will try to understand my problem and take immediate actions against it.