Unauthorised Activation of Value Added Service

#1
I had discontinued GPRS service on my mobile in 2009. The same service was activated sometime back without my knowledge and some usage happened on the same in two bill cycles. Airtel Charged me heavily for the usage as the service was not active on my mobile.

I have already paid the legitimate usage charges for calls etc. but Airtel is now threatening me to disconnect my services.

Please advise how to proceed in this matter and register a complaint against Airtel.
 

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