Tata Docomo — bill is coming with charges in spite of not using it

Address:

Ahmedabad, Gujarat, 380001

I have two docomo nos... I wanted to deactivate those two nos so i made a request for it but inspite of that my bill is coming every month with chargesto pay.. And i am not even using those two nos since months so why should i pay for the charges if i am not even using it?.. I am really fed up with the services of provider and the docomo team... Please deactivate my nos. And stop the bills from coming as soon as possible..