Airtel — Wrong bill plan activated

hi,
I am really disappointed with the service and the customer care of airtel and this has brought me down to sending a mail to you at [protected]@airtel.com, nodalofficer.[protected]@airtel.com but even that mail was left undelivered.(Mind this email address was given to me by the executives of airtel). Now let me get down to the details:
I had asked for a GPRS activation on this no([protected]-Mumbai circle). and as it is a reliance CUG that only GPRS plan that can be activated on this no. is Rs. 99 rental unlimited GPRS plan and I too had asked for the same but someone of you "Stupid" executives activated a wrong plan because of which I got a GPRS usage of Rs.1965.25 on one bill and somewhere this amount on next month's bill. I have constantly been calling the customer care for last two months and everyday I get the response that "sir our senior is aware of this issue and will call you in next 72 hours and till today this has not been resolved. Also This happened not only with this bill but next month's bill as well. Moreover now my outgoing has been barred as well due to non payment of bill. This is ridiculous I am ready to pay the bill but atleast these people should settle the amount. I am really pissed off with your service and with service of this kind I dont think I will suggest Airtel to anyone.
Kindlylook into this ASAP.