Airtel Post Paid
I Have surrendered my post paid account on 13/03/08 but this month i got a bill for 364.05 Rs

Iam balachandar and i had a post paid account in airtel thinking that it's a best service in communication but after few months only i came to that its not good in customer care, so i have surrendered my airtel no. After two months i got my airtel bill for 364.05Rs and i cant digest this. i need a immediate reply for concern person.