Idea Cellular — Cheating by Idea persons & no reply from customer care

Address:

South Delhi, Delhi

A person by the name of Mr. Kapil (Phone number: [protected] & [protected]), from Idea cellular, collected document and Rs. 500/- cheque from me, for conversion of my two prepaid numbers ([protected] & [protected]) to post paid. He did so around one month back.
After pursuing the matter with him for long, My pre-paid service of the number [protected] was abandoned for few days. Mr. Kapil and one of his colleague Mr. Anil (Phone number [protected]) said that after around one-two hour of blocking of pre-paid services, Post paid services will be started.
post-paid service has not been started. Now, none of them are picking up the phone and neither replying on mail.
Please address my grievance by pursuing the matter.

From Idea company, Mr. Kapil visited my office campus on 31/05/11. and got my form filled and collected the documents from me. He didn't provide me any receipt and i also, believing the person and Idea cellular, and being busy, didn't ask for it.
The cheque details are as Under:
Cheque Number: 926231
Bank & Branch: Canara Bank, C-DOT campus, Mehraulli, New Delhi
Date: 31/05/11
Amount: Rs. 500/- (For Pre-paid to Post-paid conversion of two mobile numbers ,i.e. [protected] & [protected])
Drawn in Favor of Idea Cellular Ltd.
Cheque has been incashed on 02/06/11.
Details of the contact persons from Idea:

Mr. Kapil: Phone number: [protected] & [protected]
Mr. Anil: Phone number: [protected]
Mail Id (from which they or their colleague used to mail): [protected]@gmail.com
My numbers have still not been converted and Mr. Kapil is not picking the phone either.
Please address the issue


Regards
Vikas Dwivedi
Ph: [protected]
E-mail ID: contact.vikas.[protected]@gmail.com