Airtel — over bill complaint

I am using airtel connection since long but m frustrated with my over bills... Last time i have changed my plan but still i got the same excess bill of my connection... They even promise me about my bill that it will not repeat it again but i find no improvement. It seems your representatives just make fake commitment everytime you suppose to have call recordings you can check what has been promised me.

I can't pay this access bill pls change my plan as i have already confirmed, and send me new updated bill and if it is not happen with in week then i have to take further step so take it on serious note and provide me solution on urgent bases.