Airtel
Automatic miss calls

I m using airtel pre paid connection 9815781488. from last month i m contineosly reciving call from unknown number and they all say that i miss called at thier numbers . plz find solution to this problem . i ve manually barred my outgoing calls but the miss calls to unknown number is still contieous from my number . i m just fet up of this . i ve complaited about it to customer care many time but problem contineous.