Consumer Redressal

I am a customer of Vodafone since 2002 around, The number was registered inmy name in prepaid plan. Later in 2006 I took postpaid plan from Vodafone when they had visited my Company ABN Amro with some corporate offers. I had no idea that they transfered my number to CP Account. And there was no clue as well as I was only paying the bill till now. I left Company in 2010, everything was as normal the bill was received by me as usual at my registered residential address and I was paying accordingly. Now I cannot afford the huge sum of their bill amount hence I want to switch the plan to prepaid. I went to their Gallery in Thane, where they asked for the Authorised Signatory's approval who are RBS staff to modify my plan. I am not aware of those names which they showed me, but vodafone is not ready to co-operate in this matter. They called me and gave the email Ids of that RBS staff, whom I mailed, but they are not responding , who knows whether they are still working there as our Company