Idea Cellular — blank calls from +92 country code

Address:

Thane, Maharashtra

Dear sir,
i'm getting blank calls from number [protected]. After searching on internet i find out its number from Pakistan.
First time when this kind of call came, i was in meeting so i disconnect call & after some time I called back without looking at number. Initially i thought it might be coincidence, but this is happening regularly nowadays.
Idea customer care please take a note of this.