Vodafone India — fraud charges on international roaming and harassing now

The mobile service provider Vodafone India has charged excessively very high on my international roaming data usage. There is no provision for requesting a international data roam separately when you request for activation for international roaming. Along with the voice calling and sms, Data also gets activated.
Vodafone has charged approximately inr 14, 000/- only for data usage for 23 mb. This is a data leakage by accident, the service for international data roam was not requested by me for activation. The total bill amount is rupees 17000.00 (Plus the applicable taxes) which is much over and above my credit limit assigned to my mobile number.

I have been reaching out to customer care over emails and phone requesting vodafone to waive-off the charges incurred against international data usage. The charges are way beyond the credit limit assigned. I should have been informed or my services should have been disconnected once reaching the credit limit. Their response to this is credit limit is dynamic Credit limit as per vodafone seems to be as per their convenience . I would like to file a case against vodafone for this fraud tricks to charge the customers. Kindly assist with necessary details and steps.