Mobile Number — Calls from unknown number

Address:

400083

Hi,
Calls are getting received from an unknown number on my mother's phone. The number is [protected].
Since last 2-3 days calls are getting received but no one is talking.
My father called on this no. A lady picked up & said that it was dialled by mistake.
But again a missed call & a call was received at 03:35AM & 03:40AM. When called back no one spoke.