Airtel — postpaid bill overcharged/ error

I am using the airtel postpaid with the monthly plan of ₹ 649 of which generally i get of bill of ₹ 750-770 but this month i received a bill of ₹ 1910.
When i enquired at customer care to resolve my problem they said you have to pay it as these are your sms charges. The sms charges mentioned or anything extra i have not used it and i wanted to waiver off the unwanted/unused charges sent with my bill.
As i have visited the airtel store and they spoke to the customer care and mentioned about the error in the bill and it’ll get wavy off still when i spoke to the customer care again they said i have to pay the bill which is itself is so mismanagement and unfortunately unprofessional.
Please make sure you look into this matter and resolve it as soon as possible cause this huge bill i am not going to pay without using any of this amount.
It’s really unfortunate i that i am facing such problem thinking it’s the leading portal and switched my connection from vodafone to your company.
I want you to the resolve the problem earliest and my normal bill with zero error as i won’t pay the overcharged billed amount.