Airtel Mobile Number — phone call from unknown mobile number

Address:

New Delhi, Delhi, 110053

I have received a phone call at my mobile number ([protected]) from an unknown number ([protected]). The given number is from airtel company, i had received a call on tuesday[protected] at around 1:40 pm in the noon.
A lady was asking about my wife when i had received the call on that time. I have the call recording of discussing with the phone call.
After that i investigated about the unknown number from another mobile number, the lady has denied that she did not call me on tuesday and making unnecessary stories for it and she is not accepting that she had called me on tuesday.

I have doubt that someone is trying to take personal information about my wife.