wants some information to close my postpaid connection

I am Kanika Arora.......my cell number is 9212733820......

I want to close my postpaid connection.I had taken the roaming package.Now the sceme has changed and it is not statisfing my needs.The last date of this connection is 6th may and i want to close it before the new month starts. so help me out.

please tell me the procedure how to close my account.