Fake Call From Pakistan +92 Airtel — Unknown international calls

Address:

Kolkata, West Bengal

Hi, I'm getting phone calls from unsolicited international numbers in wee hours of the morning. these call duration is 1-2sec and these are missed calls. I called DOT and my service provider but no one has taken any complain. service provider asked me to log a police complain. I'm bit worried and wanted to know the way out of not getting this call without changing my number.please help. Thanks in anticipation.