Hi all Thanx for ur valuable suggestions.....I called up customer care and asked them to disconnect my service and then i get a call from the retention team that they would waive off the extra amount and i need to pay only the rental....Also Wen i asked him to disconnect my connection and told him that then i am done with airtel....he started to give me a new funda that i need to continue with the service only then the amount will be waived off and reflected in the coming bill that would be generated.Else he can only disconnect the connection...Is it like that????On top of all this he was willing to change my plan to unlimited in just 699 rental.I am not sure that i should continue or disconnect the services completely as airtel is a fraud company and they can charge any amount they want even in future.Not trustworhty.Also thanx for the above calculation that explains it well....to download so much of data in a month is completely impossible....They r insane.🙁