Idea Cellular — unnecessary bills

I have been trying to either port my idea postpaid connection to any other service provider or i am trying to port it to prepaid idea connection from past six months. But the idea consumer center are not doing it.

Many times i have paid my monthly bill in advance and even for next month but they are still not porting my postpaid connection.

I have taken idea sim out from my mobile in February But still they are continously adding monthly rental bill to my account. I am really fed from idea.