Airtel — wrongly charged on international roaming

I am using airtel number as last 16-17 years and recently i went to international. For international i have activated only incoming calls and sms services and not attend any incoming calls but i have received huge bill as:

Total charges as per usage in international roaming : rs 112462/-

For calls, i took their local provider sim and using for calling and other services. For data usage, also were getting there local operator name and not getting airtel in data point.

My point if i have not activated data pack why airtel has activated on my number.

I told them i am ready to pay only domestic charges with activated rs. 149 pack charges.

Every time i am getting warring from them about disconnect my number if not pay full payment.

Please guide me to resolve my concern.

Thank you

Saurabh