Airtel lanline gets callsf rom unauthorized
Blank calls from 9661836216

I have an airtel landline and i've been receiving calls from no 9661836216 either this is a saudi arab no or a number on found on this link http://inconsumercomplaints.com/complaints/21932/page/2 some shweta sharma. No one says anything when i pickup although you can hear the person on the other side and then it says your call has been put on hold i've never bothered calling the number back! This is becoming a nuisance now as the frequency of calls have increased in the last month! Please advise!

preeti