Consumer Redressal

I had taken a post paid plan by the name of \'Talk More 299\' in Oct\'12 on my mobile no 8100226199, in which Vodafone was providing deduction of Rs 100 as discount making the actual rent as Rs 199. This was part of the plan and the customer was entitled to this as a special offer. Anyone taking this plan during that period would be entitled to actual rent of Rs 199. Suddenly in the bill for July\'13, I found out that they have deducted Rs 50 only and not Rs 100 as in the previous bills. I have written to customer care, Nodal Officer and Appellate authority but nothing has happened. They have written me back stating they can continue to provide rs 100 discount as part of the plan for another 3 months but not more. They have even called up and told me that they can change plans having offered earlier to customers as per the change in system and if the Management thinks so. They are also not providing soft copy of itemized bills from May\'13 onwards in spite of several requests.