Airtel smartbytes fraud

I have been a customer of airtel for around 6-7 years, but will be discontinuing the services because of the "smartbytes charges" they impose on the customers. Within 2 months, I have received additional bills of 1500 I.E. Total of 000. This kind of service should be verified by the use of credit card or debit card only and not just based on clicking the offer. Infact this service is specifically designed so that some users who are not so educated about the computers and stuff, will accidentally click on this and thus airtel will have the excuse that the customer demanded it. Since my payment mode is ecs, ( I really regret the day I chose ecs) I cant really do anything except discontinuing the broadband connection. My contact number is 678, in case you give any vague replies as to "we couldnt contact you coz no contact details"