Airtel — Wrong additional charge levied for ISD calls

Complaint about: airtel mobile bill (1799 rs family plan);
Five numbers connected under it.
Airtel has charged isd calls in my mobile bill. No isd calls were made from my numbers but they had very well presented the charges with fraudulent call details. They have given details of the isd calls in itemized bill, but those all are fake as no such calls were made from my numbers. I have been extra charged for 3 isd call (3356 rs). I never do any isd calls from my numbers.