Trai — cross connection

I am using airtel network. I tried to call my friends no it is getting connected to other no which i dont know n i have to face abuses. I talked to shhama misra airtel representative. She is not even admiting. She is telling me to go to police we cant do anything. The no on which tried to cal is my friends no n it is saved in my phone with name still they are telling that there is no problem from our side. This is not first tym i m facing this problem, some days ago it had happened the same when i called my father too. Airtel representatives are not technically sound and they tried befool me.