Extra Billing Amount on Vodafone Postpaid Number

Location/place: Rohini,Delhi

Name of company/service: Vodafone

I got my Vodafone no converted from Prepaid to postpaid on 29th April..But i did not get all the services on my number as told by customer care executive..I complained about it so many times,but nothing happened..Finally,i lodged a complaint at consumer forum and i got all my services activated on 13th of May..and now,they have sent a bill which is having Bill rental for that duration for which my services were not activated..So,kindly do me favour and do something against it asap..

Thanks in advance.