Complaint regarding Airtel Post Paid bill dispute

Airtel network as claimed a case against me that I didn’t paid postpaid bill of my mobile number 97xxxxxx9 . But I paid the total bill of 900 and later 700 twice in the month of January and requested them to convert postpaid to prepaid. But from past two months they are calling me to pay the bill of next months even though I didn’t used. They pretended me of blocking my aadhar number I said do what ever they want as I paid the bill. But now I received a phone call from nampally that a case is filed against me..please solve my problem

Nagaraju Deekonda
Hyderabad 500070, Telangana
Email: gxxxxxxxx9@gmail.com