Airtel Mobile Number — Unnecessary messages and calls from mobile number

Address:

Palakkad, Kerala

From this [protected] airtel number coming unnecessary messages and phone calls to my sister number.She was in more depression now.so it makes torture and illness from her studies.many of times i am warning to that number but again and again it is continuing.. so give an solution for that..what i should do...?

sudhan mc
[protected]@gmail.com