Idea Cellular — Unfair Billing

I am Sunil Rameshlal Sangtani from Nashik having an Idea postpaid number from last 5 years. I am paying all my bills regularly. My average billing is approx Rs.700 - 1000 . Till today i had not used any kind od ISD calls on this number. Also i didn't activated the ISD calling facilty till today. Inspite of that Idea cellular had started calling me from 01/07/2009 saying that you had used your phone more than your credit limit. I had enqire about the bill then they told me that your bill is of Rs. 8203.14 and you have to pay Rs. 7000 immediately against interim payment of bill. I was shocked to hear this coz i didn't used so. I had asked them to provide me the details of such bill. They was tolrading me and told that they will genrate me the bill as per my bill cycle only. Then they told me that if i didn't make the said payment before 06/07/09 they will directly block my outgoing facility. Then they called me and told me the ISD calls details. They are saying that i had used ISD service on 27/06/2009 which amounted to Rs. 6543.60. I just want to know that without any application how the ISD facility was started on my phone and when i am not speaking to that number how they can charge me the bill to my account. The ISD number is [protected]. I am sure that i didn't maked such calls. If they are sure they should procide me the evidences of recorded voice clipings of such calls. Also when i called on 12345 custmor care on 11.00 am on 06/07/2009 they told me that my ISD faciltiy is activated on 30/06/2009. They charged me the bill of 27/06/2009. How disgusting is there records.
Kindly check these matter and way off all my unfair bill.
Thank You.